Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various chiefly aquatic, eukaryotic, photosynthetic organisms, ranging in size from single-celled forms to the giant kelp. Algae were once considered to be plants but are now classified separately because they lack true roots, stems, leaves, and embryos.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of many aquatic photosynthetic organisms, whose size ranges from a single cell to giant kelps and whose form is very diverse; some are eukaryotic and some prokaryotic; includes the seaweeds.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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 confervæ, etc. The algae are primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves.

from The Century Dictionary and Cyclopedia

  • n. A cryptogam of the class of Algæ.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

Etymologies

Latin, seaweed.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • The alga, which is native to the Pacific Ocean, first showed up three years ago in

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  • In one, domestic sewage is utilized to produce an alga which is then used for fish culture.

    Chapter 13

  • Potter was originated the idea that lichens were a symbiosis between a fungus and an alga.

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  • It is simply the blue-green alga trichodesmus that imparts a red color to water!

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  • Without these mutations springing up to propel a single-celled organism into full humanity, we'd still be a smear of blue-green alga on a rock.

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  • However, algae that secrete calcium carbonate, such as coralline red algae and an abundant calcifying green alga known as Halimeda, are almost always significant contributors as well.

    Coral reef

  • But we also might consider yeast and other fungi, or even unicellular alga.

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  • If you want carbon sequestration in the ocean, dump some powdered iron in, the alga bloom will take up tons of CO2, and it will certainly be cheaper and more effective than this hair-brained bag scheme. zilfondel Says:

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  • But these are being overrun by Codiaceae algae in the shallows and by pea-soup alga Caulerpa taxifolia in deeper water.

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  • Currently researchers in California are attempting to eradicate the marine green alga Caulerpa which has recently invaded that region.

    Invasive species

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