cyanobacterium

From cyano- +‎ bacterium.

cyanobacterium (plural cyanobacteria)

1. (biology) Any of very many photosynthetic prokaryotic microorganisms, of phylum Cyanobacteria, once known as blue-green algae.
   • 2003, Bill Bryson, A Short History of Nearly Everything, BCA 2003, p. 262:

     At some point in the first billion years of life, cyanobacteria, or blue-green algae, learned to tap into a freely available resource – the hydrogen that exists in spectacular abundance in water.

   • 2011, Terence Allen and Graham Cowling, The Cell: A Very Short Introduction, Oxford 2011, p. 91:

     Photosynthesis was established some billion years ago by ancient bacterial precursors of modern cyanobacteria.

• blue-green alga

• bacterium

• Cyanobacteria