Dictionary
blue'-green al'gae
Biol.
a widely distributed group of predominantly photosynthetic prokaryotic organisms of the subkingdom Cyanophyta, resembling phototrophic bacteria, occurring singly or in colonies in diverse habitats: some species can fix atmospheric nitrogen. Also called
cyanobacteria. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.