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Cyanobacteria. (sÄ«'ÉnÅbÄktÄ­r`ÄÉ, sÄ«-Än'Åâ) or. photosynthetic bacteria bacteria[pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles.
1 : phylum of prokaryotic aguatic bacteria that obtain their energy through photosynthesis. 2  They are often referred to as blue-green algae, even though it is now known that they are not related to any of the other algal groups, which are all eukaryotes. 3  Cyanobacteria may be single-celled or colonial.