Alga

2 definitions found

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

  Alga \Al"ga\, n.; pl. {Alg[ae]} or {algae}. [L., seaweed.]
     (Bot.)
     A kind of seaweed; pl. the class of cellular cryptogamic
     plants which includes the black, red, and green seaweeds, as
     kelp, dulse, sea lettuce, also marine and fresh water
     conferv[ae], etc. The algae are primitive


     chlorophyll-containing mainly aquatic eukaryotic organisms
     lacking true stems and roots and leaves.
     [1913 Webster + WordNet 1.5]

From WordNet (r) 2.0 [wn]:

  alga
       n : primitive chlorophyll-containing mainly aquatic eukaryotic
           organisms lacking true stems and roots and leaves [syn: {algae}]