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

mahogany \mahog"any\, mahogany tree \mahog"any tree`\, n.
   from the south american name.
   1. bot. a large tree of the genus swietenia swietenia
      mahogoni, found in tropical america.
      1913 webster

   note: several other trees, with wood more or less like
         mahogany, are called by this name; as, african mahogany
         khaya senegalensis, australian mahogany
         eucalyptus marginatus, bastard mahogany batonia
         apetala of the west indies, indian mahogany cedrela
         toona of bengal, and trees of the genera soymida and
         chukrassia, madeira mahogany persea indica,
         mountain mahogany, the black or cherry birch betula
         lenta, also the several species of cercocarpus of
         california and the rocky mountains.
         1913 webster

   2. the wood of the swietenia mahogoni. it is of a reddish
      brown color, beautifully veined, very hard, and
      susceptible of a fine polish. it is used in the
      manufacture of furniture.
      1913 webster

   3. a table made of mahogany wood. colloq.
      1913 webster

   to be under the mahogany, to be so drunk as to have fallen
      under the table. eng.

   to put one's legs under some one's mahogany, to dine with
      him. slang
      1913 webster
see also:
swietenia swietenia mahogoni khaya senegalensis eucalyptus marginatus batonia apetala cedrela toona 
soymida chukrassia persea indica betula lenta cercocarpus 
swietenia mahogoni to be under the mahogany to put one's legs under some one's mahogany 

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

birch \birch\ b~erch, n.; pl. birches -e^z. oe.
   birche, birk, as. birce, beorc; akin to icel. bj"ork, sw.
   bj"ork, dan. birk, d. berk, ohg. piricha, mhg. birche,
   birke, g. birke, russ. bereza, pol. brzoza, serv. breza, skr.
   bh=urja. root254. cf. 1st birk.
   1. a tree of several species, constituting the genus
      betula; as, the white or common birch betula alba
      also called silver birch and lady birch; the dwarf birch
      betula glandulosa; the paper or canoe birch betula
      papyracea; the yellow birch betula lutea; the black
      or cherry birch betula lenta.
      1913 webster

   2. the wood or timber of the birch.
      1913 webster

   3. a birch twig or birch twigs, used for flogging.
      1913 webster

   note: the twigs of the common european birch b. alba, being
         tough and slender, were formerly much used for rods in
         schools. they were also made into brooms.
         1913 webster

               the threatening twigs of birch.    --shak.
         1913 webster

   4. a birch-bark canoe.
      1913 webster

   birch of jamaica, a species bursera gummifera of
      turpentine tree.

   birch partridge. zool. see ruffed grouse.

   birch wine, wine made of the spring sap of the birch.

   oil of birch.
      a an oil obtained from the bark of the common european
          birch betula alba, and used in the preparation of
          genuine and sometimes of the imitation russia
          leather, to which it gives its peculiar odor.
      b an oil prepared from the black birch betula lenta,
          said to be identical with the oil of wintergreen, for
          which it is largely sold.
          1913 webster
see also:
birches birk betula betula alba betula glandulosa betula papyracea 
betula lutea betula lenta birch of jamaica bursera gummifera birch partridge 
ruffed grouse birch wine oil of birch 

[3] : WordNet (r) 2.0

betula lenta
     n : common birch of the eastern united states having spicy brown
         bark yielding a volatile oil and hard dark wood used for
         furniture syn: sweet birch, cherry birch, black
         birch
see also:
sweet birch cherry birch black birch 

Betula >> B Words
Betula, definition of term: Betula
betula_pag1.html