blue-green alga

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NounEdit

blue-green alga ‎(plural blue-green algae)

  1. Any member of the cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere.

Usage notesEdit

  • The term alga is now considered improper usage, since true algae are eukaryotic organisms, rather than bacteria. It remains in common use among aquarists, however.

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