Meaning of pyrrophyte

pyr•ro•phyte

Pronunciation: (pir'u-fīt"), [key]
— n.
  1. any of various single-celled, biflagellated algae, of the phylum Pyrrophyta, esp. the dinoflagellates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.