[1] : The Collaborative International Dictionary of English v.0.48

oak \oak\ =ok, n. oe. oke, ok, ak, as. =ac; akin to d.
   eik, g. eiche, ohg. eih, icel. eik, sw. ek, dan. eeg.
   1913 webster
   1. bot. any tree or shrub of the genus quercus. the oaks
      have alternate leaves, often variously lobed, and
      staminate flowers in catkins. the fruit is a smooth nut,
      called an acorn, which is more or less inclosed in a
      scaly involucre called the cup or cupule. there are now
      recognized about three hundred species, of which nearly
      fifty occur in the united states, the rest in europe,
      asia, and the other parts of north america, a very few
      barely reaching the northern parts of south america and
      africa. many of the oaks form forest trees of grand
      proportions and live many centuries. the wood is usually
      hard and tough, and provided with conspicuous medullary
      rays, forming the silver grain.
      1913 webster

   2. the strong wood or timber of the oak.
      1913 webster

   note: among the true oaks in america are:

   barren oak, or

   black-jack, quercus nigra.

   basket oak, quercus michauxii.

   black oak, quercus tinctoria; -- called also yellow oak
      or quercitron oak.

   bur oak see under bur., quercus macrocarpa; -- called
      also over-cup or mossy-cup oak.

   chestnut oak, quercus prinus and quercus densiflora.

   chinquapin oak see under chinquapin, quercus
      prinoides.

   coast live oak, quercus agrifolia, of california; -- also
      called enceno.

   live oak see under live, quercus virens, the best of
      all for shipbuilding; also, quercus chrysolepis, of
      california.

   pin oak. same as swamp oak.

   post oak, quercus obtusifolia.

   red oak, quercus rubra.

   scarlet oak, quercus coccinea.

   scrub oak, quercus ilicifolia, quercus undulata, etc.
      

   shingle oak, quercus imbricaria.

   spanish oak, quercus falcata.

   swamp spanish oak, or

   pin oak, quercus palustris.

   swamp white oak, quercus bicolor.

   water oak, quercus aquatica.

   water white oak, quercus lyrata.

   willow oak, quercus phellos.
      1913 webster among the true oaks in europe are:

   bitter oak, or

   turkey oak, quercus cerris see cerris.

   cork oak, quercus suber.

   english white oak, quercus robur.

   evergreen oak,

   holly oak, or

   holm oak, quercus ilex.

   kermes oak, quercus coccifera.

   nutgall oak, quercus infectoria.
      1913 webster

   note: among plants called oak, but not of the genus
         quercus, are:

   african oak, a valuable timber tree oldfieldia
      africana.

   australian oak or she oak, any tree of the genus
      casuarina see casuarina.

   indian oak, the teak tree see teak.

   jerusalem oak. see under jerusalem.

   new zealand oak, a sapindaceous tree alectryon
      excelsum.

   poison oak, a shrub once not distinguished from poison ivy,
      but now restricted to rhus toxicodendron or rhus
      diversiloba.

   silky oak or silk-bark oak, an australian tree
      grevillea robusta.
      1913 webster

   green oak, oak wood colored green by the growth of the
      mycelium of certain fungi.

   oak apple, a large, smooth, round gall produced on the
      leaves of the american red oak by a gallfly cynips
      confluens. it is green and pulpy when young.

   oak beauty zool., a british geometrid moth biston
      prodromaria whose larva feeds on the oak.

   oak gall, a gall found on the oak. see 2d gall.

   oak leather bot., the mycelium of a fungus which forms
      leatherlike patches in the fissures of oak wood.

   oak pruner. zool. see pruner, the insect.

   oak spangle, a kind of gall produced on the oak by the
      insect diplolepis lenticularis.

   oak wart, a wartlike gall on the twigs of an oak.

   the oaks, one of the three great annual english horse races
      the derby and st. leger being the others. it was
      instituted in 1779 by the earl of derby, and so called
      from his estate.

   to sport one's oak, to be "not at home to visitors,"
      signified by closing the outer oaken door of one's
      rooms. cant, eng. univ.
      1913 webster
see also:
quercus acorn barren oak black-jack quercus nigra basket oak 
quercus michauxii black oak quercus tinctoria yellow oak quercitron oak 
bur oak bur quercus macrocarpa over-cup mossy-cup oak 
chestnut oak quercus prinus quercus densiflora chinquapin oak chinquapin 
quercus prinoides coast live oak quercus agrifolia enceno live oak 
live quercus virens quercus chrysolepis pin oak swamp oak 
post oak quercus obtusifolia red oak quercus rubra scarlet oak 
quercus coccinea scrub oak quercus ilicifolia quercus undulata shingle oak 
quercus imbricaria spanish oak quercus falcata swamp spanish oak quercus palustris 
swamp white oak quercus bicolor water oak quercus aquatica water white oak 
quercus lyrata willow oak quercus phellos bitter oak turkey oak 
quercus cerris cerris cork oak quercus suber english white oak 
quercus robur evergreen oak holly oak holm oak quercus ilex 
kermes oak quercus coccifera nutgall oak quercus infectoria african oak 
oldfieldia africana australian oak she oak casuarina indian oak 
teak jerusalem oak jerusalem new zealand oak alectryon excelsum 
poison oak rhus toxicodendron rhus diversiloba silky oak silk-bark oak 
grevillea robusta green oak oak apple cynips confluens oak beauty 
biston prodromaria oak gall gall oak leather oak pruner 
pruner oak spangle diplolepis lenticularis oak wart the oaks 
to sport one's oak 

[2] : The Collaborative International Dictionary of English v.0.48

ivy \i"vy\, n.; pl. ivies. as. imacfig; akin to ohg. ebawi,
   ebah, g. epheu. bot.
   a plant of the genus hedera hedera helix, common in
   europe. its leaves are evergreen, dark, smooth, shining, and
   mostly five-pointed; the flowers yellowish and small; the
   berries black or yellow. the stem clings to walls and trees
   by rootlike fibers.
   1913 webster

         direct
         the clasping ivy where to climb.         --milton.
   1913 webster

         ye myrtles brown, with ivy never sere.   --milton.
   1913 webster

   american ivy. bot. see virginia creeper.

   english ivy bot., a popular name in america for the ivy
      proper hedera helix.

   german ivy bot., a creeping plant, with smooth, succulent
      stems, and fleshy, light-green leaves; a species of
      senecio senecio scandens.

   ground ivy. bot. gill nepeta glechoma.

   ivy bush. bot. see mountain laurel, under mountain.
      

   ivy owl zool., the barn owl.

   ivy tod bot., the ivy plant. --tennyson.

   japanese ivy bot., a climbing plant ampelopsis
      tricuspidata, closely related to the virginia creeper.
      

   poison ivy bot., an american woody creeper rhus
      toxicodendron, with trifoliate leaves, and
      greenish-white berries. it is exceedingly poisonous to the
      touch for most persons.

   to pipe in an ivy leaf, to console one's self as best one
      can. obs. --chaucer.

   west indian ivy, a climbing plant of the genus
      marcgravia.
      1913 webster
see also:
ivies hedera hedera helix american ivy virginia creeper english ivy 
german ivy senecio senecio scandens ground ivy nepeta glechoma 
ivy bush mountain laurel mountain ivy owl ivy tod 
japanese ivy ampelopsis tricuspidata poison ivy rhus toxicodendron to pipe in an ivy leaf 
west indian ivy marcgravia 

[3] : The Collaborative International Dictionary of English v.0.48

poison \poi"son\, n. f. poison, in old french also, a potion,
   fr. l. potio a drink, draught, potion, a poisonous draught,
   fr. potare to drink. see potable, and cf. potion.
   1. any agent which, when introduced into the animal organism,
      is capable of producing a morbid, noxious, or deadly
      effect upon it; as, morphine is a deadly poison; the
      poison of pestilential diseases.
      1913 webster

   2. that which taints or destroys moral purity or health; as,
      the poison of evil example; the poison of sin.
      1913 webster

   poison ash. bot.
      a a tree of the genus amyris amyris balsamifera
          found in the west indies, from the trunk of which a
          black liquor distills, supposed to have poisonous
          qualities.
      b the poison sumac rhus venenata. u. s.

   poison dogwood bot., poison sumac.

   poison fang zool., one of the superior maxillary teeth of
      some species of serpents, which, besides having the cavity
      for the pulp, is either perforated or grooved by a
      longitudinal canal, at the lower end of which the duct of
      the poison gland terminates. see illust. under fang.

   poison gland biol., a gland, in animals or plants, which
      secretes an acrid or venomous matter, that is conveyed
      along an organ capable of inflicting a wound.

   poison hemlock bot., a poisonous umbelliferous plant
      conium maculatum. see hemlock.

   poison ivy bot., a poisonous climbing plant formerly
      rhus toxicodendron, or rhus radicans, now classified
      as toxicodendron radicans of north america. it is
      common as a climbing vine, especially found on tree
      trunks, or walls, or as a low, spreading vine or as a
      shrub. as a low vine it grows well in lightly shaded
      areas, recognizable by growing in clusters of three
      leaves. its leaves are trifoliate, rhombic-ovate, and
      variously notched. its form varies slightly from location
      to location, leading to some speculation that it may
      consist of more than one species. many people are poisoned
      by it, though some appear resistant to its effects.
      touching the leaves may leave a residue of an oil on the
      skin, and if not washed off quickly, sensitive areas of
      skin become reddened and develop multiple small blisters,
      lasting for several days to several weeks, and causing a
      persistent itch. the toxic reaction is due to an oil,
      present in all parts of the plant except the pollen,
      called urushiol, the active component of which is the
      compound pentadecylacatechol according to a

      href="http:/www.jaxmed.com/articles/diseases/poison_ivy_dermatitis.htm">charles
      h. booras. see poison sumac. it is related to poison
      oak, and is also called mercury.

   poison nut. bot.
      a nux vomica.
      b the tree which yields this seed strychnos
          nuxvomica. it is found on the malabar and coromandel
          coasts.

   poison oak bot., a dermatitis-producing plant often
      lumped together with the poison ivy toxicodendron
      radicans in common terminology, but more properly
      distinguished as the more shrubby toxicodendron
      quercifolium syn. toxicodendron diversilobum, common
      in california and oregon. opinion varies as to whether the
      poison oak and poison ivy are only variants of a single
      species. see poison ivy, above.

   poison sac. zool. same as poison gland, above. see
      illust. under fang.

   poison sumac bot., a poisonous shrub formerly considered
      to be of the genus rhus rhus venenata, but now
      classified as toxicodendron vernix; -- also called
      poison ash, poison dogwood, and poison elder. it has
      pinnate leaves on graceful and slender common petioles,
      and usually grows in swampy places. both this plant and
      the poison ivy toxicodendron radicans, formerly rhus
      toxicodendron have clusters of smooth greenish white
      berries, while the red-fruited species of this genus are
      harmless. the tree rhus vernicifera which yields the
      celebrated japan lacquer is almost identical with the
      poison sumac, and is also very poisonous. the juice of the
      poison sumac also forms a lacquer similar to that of
      japan.
      1913 webster +pjc

   syn: venom; virus; bane; pest; malignity.

   usage: poison, venom. poison usually denotes something
          received into the system by the mouth, breath, etc.
          venom is something discharged from animals and
          received by means of a wound, as by the bite or sting
          of serpents, scorpions, etc. hence, venom specifically
          implies some malignity of nature or purpose.
          1913 webster
see also:
potable potion poison ash amyris amyris balsamifera rhus venenata 
poison dogwood poison fang fang poison gland poison hemlock 
conium maculatum hemlock poison ivy rhus toxicodendron rhus radicans 
toxicodendron radicans urushiol pentadecylacatechol poison sumac poison oak 
mercury poison nut strychnos nuxvomica poison oak toxicodendron radicans 
toxicodendron quercifolium toxicodendron diversilobum poison ivy poison sac rhus 
toxicodendron vernix poison ash poison dogwood poison elder rhus toxicodendron 
rhus vernicifera poison venom 

[4] : The Collaborative International Dictionary of English v.0.48

mercury \mer"cury\, n. l. mercurius; akin to merx wares.
   1. rom. myth. a latin god of commerce and gain; -- treated
      by the poets as identical with the greek hermes, messenger
      of the gods, conductor of souls to the lower world, and
      god of eloquence.
      1913 webster

   2. chem. a metallic element mostly obtained by reduction
      from cinnabar, one of its ores. it is a heavy, opaque,
      glistening liquid commonly called quicksilver, and is
      used in barometers, thermometers, etc. specific gravity
      13.6. symbol hg hydrargyrum. atomic weight 199.8.
      mercury has a molecule which consists of only one atom. it
      was named by the alchemists after the god mercury, and
      designated by his symbol, mercury.
      1913 webster

   note: mercury forms alloys, called amalgams, with many
         metals, and is thus used in applying tin foil to the
         backs of mirrors, and in extracting gold and silver
         from their ores. it is poisonous, and is used in
         medicine in the free state as in blue pill, and in its
         compounds as calomel, corrosive sublimate, etc. it is
         the only metal which is liquid at ordinary
         temperatures, and it solidifies at about -39deg
         centigrade to a soft, malleable, ductile metal.
         1913 webster

   3. astron. one of the planets of the solar system, being
      the one nearest the sun, from which its mean distance is
      about 36,000,000 miles. its period is 88 days, and its
      diameter 3,000 miles.
      1913 webster

   4. a carrier of tidings; a newsboy; a messenger; hence, also,
      a newspaper. --sir j. stephen. "the monthly mercuries."
      --macaulay.
      1913 webster

   5. sprightly or mercurial quality; spirit; mutability;
      fickleness. obs.
      1913 webster

            he was so full of mercury that he could not fix long
            in any friendship, or to any design.  --bp. burnet.
      1913 webster

   6. bot. a plant mercurialis annua, of the spurge
      family, the leaves of which are sometimes used for
      spinach, in europe.
      1913 webster

   note: the name is also applied, in the united states, to
         certain climbing plants, some of which are poisonous to
         the skin, esp. to the rhus toxicodendron, or poison
         ivy.
         1913 webster

   dog's mercury bot., mercurialis perennis, a perennial
      plant differing from mercurialis annua by having the
      leaves sessile.

   english mercury bot., a kind of goosefoot formerly used
      as a pot herb; -- called good king henry.

   horn mercury min., a mineral chloride of mercury, having
      a semitranslucent, hornlike appearance.
      1913 webster
see also:
quicksilver mercurialis annua rhus toxicodendron dog's mercury mercurialis perennis english mercury 
good king henry horn mercury 

Rhus >> R Words
Rhus, definition of term: Rhus
rhus_pag1.html

Rhus toxicodendron
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Rhus toxicodendron D6
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Rhus toxicodendron 1
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