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.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 Various

plural noun
the former name for cyanobacteria
blue-green alga
See under cyanobacterium.


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