From The Collaborative International Dictionary of English v.0.44 [gcide]:
Alga \Al"ga\, noun; 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 The Collaborative International Dictionary of English v.0.44 [gcide]:
algae \algae\ n. plural of {alga}. [WordNet 1.5]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Cryptogamia \Cryp'to*ga"mi*a\ (kr?p't?-g?"m?-?), noun; pl. {Cryptogami[ae]} (-?). [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.
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, {Lycopodiace[ae]} or Club mosses, {Selaginelle[ae]}, 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, {Hepatic[ae]}, or Scale mosses and Liverworts, and possibly {Charace[ae]}, the Stoneworts. III. {{Alg[ae]}}, which are divided into {Floride[ae]}, the Red Seaweeds, and the orders {Dictyote[ae]}, {O["o]spore[ae]}, {Zo["o]spore[ae]}, {Conjugat[ae]}, {Diatomace[ae]}, and {Cryptophyce[ae]}. 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.
From WordNet (r) 2.0 [wn]:
noun
1: primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves [syn: {alga}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
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
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