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n pl :  an order of chiefly marine usu. solitary phytoflagellates that are typically enclosed in a cellulose envelope, that have one transverse flagellum running in a groove about the body, one posterior flagellum extending out from a similar median groove, usu. a single nucleus, and yellow, brown, or occas. green chromoplasts, and that include luminescent forms, important elements of marine food chains, and the flagellates of the genera Gonyaulax and Gymnodinium that cause red tide .
Similar sounding terms:  di·no·fla·gel·late 

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