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

marsh \marsh\, n. oe. mersch, as. mersc, fr. mere lake. see
   mere pool, and cf. marish, morass.
   a tract of soft wet land, commonly covered partially or
   wholly with water; a fen; a swamp; a morass. written also
   marish.
   1913 webster

   marsh asphodel bot., a plant nartheeium ossifragum
      with linear equitant leaves, and a raceme of small white
      flowers; -- called also bog asphodel.

   marsh cinquefoil bot., a plant potentilla palustris
      having purple flowers, and found growing in marshy places;
      marsh five-finger.

   marsh elder. bot.
   a the guelder-rose or cranberry tree viburnum opulus.
   b in the united states, a composite shrub growing in salt
       marshes iva frutescens.

   marsh five-finger. bot. see marsh cinquefoil above.
      

   marsh gas. chem. see under gas.

   marsh grass bot., a genus spartina of coarse grasses
      growing in marshes; -- called also cord grass. the tall
      spartina cynosuroides is not good for hay unless cut
      very young. the low spartina juncea is a common
      component of salt hay.

   marsh harrier zool., a european hawk or harrier circus
      aeruginosus; -- called also marsh hawk, moor hawk,
      moor buzzard, puttock.

   marsh hawk. zool.
   a a hawk or harrier circus cyaneus, native of both
       america and europe. the adults are bluish slate above,
       with a white rump. called also hen harrier, and mouse
       hawk.
   b the marsh harrier.

   marsh hen zool., a rail; esp., rallus elegans of
      fresh-water marshes, and rallus longirostris of
      salt-water marshes.

   marsh mallow bot., a plant of the genus althaea 
      althaea officinalis common in marshes near the
      seashore, and whose root is much used in medicine as a
      demulcent.

   marsh marigold. bot. see in the vocabulary.

   marsh pennywort bot., any plant of the umbelliferous
      genus hydrocotyle; low herbs with roundish leaves,
      growing in wet places; -- called also water pennywort.
      

   marsh quail zool., the meadow lark.

   marsh rosemary bot., a plant of the genus statice
      statice limonium, common in salt marshes. its root is
      powerfully astringent, and is sometimes used in medicine.
      called also sea lavender.

   marsh samphire bot., a plant salicornia herbacea
      found along seacoasts. see glasswort.

   marsh st. john's-wort bot., an american herb elodes
      virginica with small opposite leaves and flesh-colored
      flowers.

   marsh tea. bot.. same as labrador tea.

   marsh trefoil. bot. same as buckbean.

   marsh wren zool., any species of small american wrens of
      the genus cistothorus, and allied genera. they chiefly
      inhabit salt marshes.
      1913 webster
see also:
mere marish morass marish marsh asphodel nartheeium ossifragum 
bog asphodel marsh cinquefoil potentilla palustris marsh elder viburnum opulus 
iva frutescens marsh five-finger marsh gas gas marsh grass 
spartina cord grass spartina cynosuroides spartina juncea marsh harrier 
circus aeruginosus marsh hawk moor hawk moor buzzard puttock 
marsh hawk circus cyaneus hen harrier mouse hawk marsh hen 
rallus elegans rallus longirostris marsh mallow althaea althaea officinalis 
marsh marigold marsh pennywort hydrocotyle water pennywort marsh quail 
marsh rosemary statice statice limonium sea lavender marsh samphire 
salicornia herbacea glasswort marsh st. john's-wort elodes virginica marsh tea 
labrador tea marsh trefoil buckbean marsh wren cistothorus 

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

elder \el"der\, n. oe. ellern, eller, as. ellen, cf. lg.
   elloorn; perh. akin to ohg. holantar, holuntar, g. holunder;
   or perh. to e. alder, n. bot.
   a genus of shrubs sambucus having broad umbels of white
   flowers, and small black or red berries.
   1913 webster

   note: the common north american species is sambucus
         canadensis; the common european species s. nigra
         forms a small tree. the red-berried elder is s.
         pubens. the berries are diaphoretic and aperient. the
         european elder sambucus nigra is also called the
         elderberry, bourtree, old world elder, black
         elder, and common elder.
         1913 webster + wordnet 1.5

   box elder. see under 1st box.

   dwarf elder. see danewort.

   elder tree. bot. same as elder. --shak.

   marsh elder, the cranberry tree viburnum opulus.
      1913 webster
see also:
sambucus sambucus canadensis s. nigra s. pubens sambucus nigra elderberry 
bourtree old world elder black elder common elder box elder 
box dwarf elder danewort elder tree elder 
marsh elder viburnum opulus 

[3] : WordNet (r) 2.0

marsh elder
     n : any of various coarse shrubby plants of the genus iva with
         small greenish flowers; common in moist areas as coastal
         salt marshes of eastern and central north america syn:
         iva
see also:
iva 

Marsh Elder >> M Words
Marsh Elder, definition of term: Marsh Elder
marsh+elder_pag1.html

Elder >> E Words
Elder, definition of term: Elder
elder_pag1.html

Marsh >> M Words
Marsh, definition of term: Marsh
marsh_pag1.html

Marsh Mallow >> M Words
Marsh Mallow, definition of term: Marsh Mallow
marsh+mallow_pag1.html

Marsh Hawk >> M Words
Marsh Hawk, definition of term: Marsh Hawk
marsh+hawk_pag1.html

Elder Tree >> E Words
Elder Tree, definition of term: Elder Tree
elder+tree_pag1.html

Box Elder >> B Words
Box Elder, definition of term: Box Elder
box+elder_pag1.html

Salt Marsh >> S Words
Salt Marsh, definition of term: Salt Marsh
salt+marsh_pag1.html

Box Elder Count >> B Words
Box Elder Count, definition of term: Box Elder Count
box+elder+count_pag1.html