any of numerous chiefly marine plankton of the phylum Pyrrophyta (or, in some classification schemes, the order Dinoflagellata), usually having two flagella, one in a groove around the body and the other extending from its center.

1900–05; dino- + flagellate

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World English Dictionary
dinoflagellate (ˌdaɪnəʊˈflædʒɪlɪt, -ˌleɪt)
1.  any of a group of unicellular biflagellate aquatic organisms forming a constituent of plankton: now usually classified as a phylum of protoctists (Dinoflagellata)
2.  of or relating to dinoflagellates
[C19: from New Latin Dinoflagellata, from Greek dinos whirling + flagellum + -ate1]

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American Heritage
Medical Dictionary

dinoflagellate di·no·flag·el·late (dī'nō-flāj'ə-lĭt, -lāt', -flə-jěl'ĭt)
Any of numerous chiefly marine flagellates of the order Dinoflagellata, some species of which produce a potent neurotoxin that may cause severe food poisoning following ingestion of parasitized shellfish.

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American Heritage
Science Dictionary
dinoflagellate   (dī'nō-flāj'ə-lĭt)  Pronunciation Key 
Any of numerous one-celled organisms found mostly in the ocean, usually having two flagella of unequal length and often an armorlike covering of cellulose. Dinoflagellates are one of the main components of plankton. Since dinoflagellates have characteristics of both plants and animals, their classification is controversial. See more at red tide.
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Example sentences
Dinoflagellate algae inhabit coral, give it color and provide it with food.
The dinoflagellate algae that cause harmful red tides are normally kept on a leash by parasites.
Some dinoflagellate species are in turn symbiotic with coral species.
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