Home›Browse›C›cyanobacteriacyanobacteriaOur editors are putting together more complete content — check back in about 20 minutescyanobacteriacyanobacteria — nounnoun1. bacteria that photosynthesize, often called blue-green algae1.nounDefinitionbacteria that photosynthesize, often called blue-green algaeExampleCyanobacteria are found in oceans and freshwater.