"A single-celled organism with two flagella, occurring in large numbers in marine plankton and also found in fresh water. Some produce toxins that can accumulate in shellfish, resulting in poisoning when eaten", Late 19th century (as an adjective): from modern LatinDinoflagellata (plural), from Greek dinos 'whirling' + Latinflagellum 'small whip' (see flagellum).[dinoflagellate etymology, dinoflagellate origin, 英语词源]