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

alga \al"ga\, n.; pl. algae 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
   confervae, etc. the algae are primitive
   chlorophyll-containing mainly aquatic eukaryotic organisms
   lacking true stems and roots and leaves.
   1913 webster + wordnet 1.5
see also:
algae algae 

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

algae \algae\ n.
   plural of alga.
   wordnet 1.5
see also:
alga 

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

cryptogamia \cryp`toga"mia\ kr?p`t?-g?"m?-?, n.; pl.
   cryptogamiae -?. nl., fr. gr. krypto`s hidden, secret
   + ga`mos marriage. bot.
   the series or division of flowerless plants, or those never
   having true stamens and pistils, but propagated by spores of
   various kinds.
   1913 webster

   note: the subdivisions have been variously arranged. the
         following arrangement recognizes four classes: -- i.
         pteridophyta, or vascular acrogens.} these include
         ferns, equiseta or scouring rushes, lycopodiaceae
         or club mosses, selaginelleae, and several other
         smaller orders. here belonged also the extinct coal
         plants called lepidodendron, sigillaria, and
         calamites. ii. bryophita, or cellular acrogens.
         these include musci, or mosses, hepaticae, or
         scale mosses and liverworts, and possibly
         characeae, the stoneworts. iii. algae, which
         are divided into florideae, the red seaweeds, and
         the orders dictyoteae, oosporeae,
         zoosporeae, conjugatae, diatomaceae, and
         cryptophyceae. iv. fungi. the molds, mildews,
         mushrooms, puffballs, etc., which are variously grouped
         into several subclasses and many orders. the lichenes
         or lichens are now considered to be of a mixed nature,
         each plant partly a fungus and partly an alga.
         1913 webster cryptogamic
         cryptogamian
see also:
cryptogamiae pteridophyta vascular acrogens equiseta lycopodiaceae selaginelleae 
lepidodendron sigillaria calamites bryophita cellular acrogens 
musci hepaticae characeae algae florideae 
dictyoteae oosporeae zoosporeae conjugatae diatomaceae 
cryptophyceae fungi lichenes 

[4] : WordNet (r) 2.0

algae
     n : primitive chlorophyll-containing mainly aquatic eukaryotic
         organisms lacking true stems and roots and leaves syn: alga
see also:
alga 

[5] : Moby Thesaurus II by Grady Ward, 1.0

67 moby thesaurus words for "algae":
   ectocarpales, iceland moss, irish moss, phaeophyceae, autophyte,
   bean, bracken, brown algae, climber, conferva, confervoid, creeper,
   diatom, dulse, fern, fruits and vegetables, fucoid, fucus, fungi,
   fungus, grapevine, green algae, gulfweed, herb, heterophyte, ivy,
   kelp, legume, lentil, liana, lichen, liverwort, mold, molds, moss,
   mushroom, parasite, parasitic plant, pea, perthophyte,
   phytoplankton, plankton, planktonic algae, plant families,
   pond scum, puffball, pulse, red algae, reindeer moss, rockweed,
   rust, saprophyte, sargasso, sargassum, scum, sea lentil, sea moss,
   sea wrack, seaweed, smut, succulent, thallogens, toadstool, vetch,
   vine, wort, wrack

Algae >> A Words
Algae, definition of term: Algae
algae_pag1.html

Green Algae >> G Words
Green Algae, definition of term: Green Algae
green+algae_pag1.html