Definition of cyanobacterium
: any of a major group (Cyanobacteria) of photosynthetic bacteria that have two photosystems, produce molecular oxygen, and use water as an electron-donating substrate in photosynthesis —called also blue-green alga
Origin and Etymology of cyanobacterium
First Known Use: 1974
Medical Definition of cyanobacterium
: any of a major group (Cyanobacteria) of photosynthetic bacteria that produce molecular oxygen and use water as an electron-donating substrate in photosynthesis—called also blue-green alga
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