'dinoflagellate' definitions:

Definition of 'dinoflagellate'

(from WordNet)
noun
Chiefly marine protozoa having two flagella; a chief constituent of plankton

Definition of 'dinoflagellate'

From: GCIDE
  • dinoflagellate \dinoflagellate\ n. a member of the Dinoflagellata, chiefly marine protozoa having two flagella. The dinoflagellates form a chief constituent of plankton. [WordNet 1.5]