dinoflagellata

from The Century Dictionary.

• Those flagellate infusorians commonly called Cilioflagellata (which see).

from the GNU version of the Collaborative International Dictionary of English.

• noun and order of plankton, in some classifications it is considered a phylum of the kingdom Protista; in others it is included in the plant phylum Pyrrophyta. Its members usually have two flagella, one of which extends from its center.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun in some classifications considered a phylum of the kingdom Protista; in others included in the plant phylum Pyrrophyta