- 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.
- any of a group of unicellular biflagellate aquatic organisms forming a constituent of plankton: now usually classified as a phylum of protoctists (Dinoflagellata)
- of or relating to dinoflagellates
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