Cyanobacteria

noun

• a division of microorganisms that are related to the bacteria but are capable of photosynthesis. They are prokaryotic and represent the earliest known form of life on the earth.

  • Division Cyanobacteria, kingdom Monera
• (cyanobacteria) microorganisms of the Cyanobacteria division; blue-green algae: cultures of algae and cyanobacteria