Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic phylum within the kingdom Bacteria — (formerly within subkingdom Eubacteria) - the blue-green algae.
  • proper noun A taxonomic class within the phylum Cyanobacteria.

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

  • noun predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin cyano a blue gemstone + bacteria

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