algae

Unicellular or multicellular organisms formerly classified as plants, occurring in fresh or salt water or moist ground, that have chlorophyll and other pigments but lack true stems, roots, and leaves. Algae, which are now regarded as protists, include the seaweeds, diatoms, and phytoplankton.

Citation: 
algae. (n.d.) Collins English Dictionary – Complete and Unabridged. (1991, 1994, 1998, 2000, 2003). Retrieved August 26 2014 from http://www.thefreedictionary.com/algae
English

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