alga definition

  • noun:
    • any one of different chiefly aquatic, eukaryotic, photosynthetic organisms, varying in size from single-celled kinds on huge kelp. Algae had been when considered to be plants but are now categorized independently simply because they lack real roots, stems, leaves, and embryos.
    • any one of numerous aquatic photosynthetic organisms, whose dimensions varies from one cellular to giant kelps and whose kind is extremely diverse; some are eukaryotic many prokaryotic; includes the seaweeds.
    • A kind of seaweed; pl. the course of cellular cryptogamic flowers which includes the black, purple, and green seaweeds, as kelp, dulse, sea lettuce, in addition marine and fresh-water confervæ, etc. The algae tend to be primitive chlorophyll-containing primarily aquatic eukaryotic organisms lacking real stems and roots and leaves.
    • A cryptogam of the course of Algæ.
    • ancient chlorophyll-containing primarily aquatic eukaryotic organisms lacking true stems and origins and leaves

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