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3 definitions found
 for Marsh gas
From 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">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">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">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">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]

From The Collaborative International Dictionary of English v.0.48 :

  Carbureted \Car"bu*ret`ed\, a.
     1. (Chem.) Combined with carbon in the manner of a carburet
        or carbide.
        [1913 Webster]
  
     2. Saturated or impregnated with some volatile carbon
        compound; as, water gas is carbureted to increase its
        illuminating power. [Written also carburetted.]
        [1913 Webster]
  
     Carbureted hydrogen gas, any one of several gaseous
        compounds of carbon and hydrogen, some of with make up
        illuminating gas.
  
     Light+carbureted+hydrogen,+methane+({CH4">Light carbureted hydrogen, methane ({CH4), also called
        marsh gas, and fire damp.
        [1913 Webster +PJC] Carburetor

From WordNet (r) 3.0 (2006) :

  marsh gas
      n 1: methane gas produced when vegetation decomposes in water

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