Dinoflagellata
noun pluralMedical Definition of Dinoflagellata
: a division or phylum of chiefly marine unicellular plantlike protists that comprise the dinoflagellates, that are typically enclosed in a cellulose envelope, that have one transverse flagellum running in a groove about the body and one posterior flagellum extending out from a similar median groove, and that include luminescent forms, important elements of marine food chains, and most of the flagellates that cause red tide (such as members of the genus Gymnodinium)
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Merriam-Webster unabridged
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