Top Definition
The first photosynthetic bacteria to use water as a source of electrons to reduce carbon dioxide and release oxygen into the atmosphere, enabling aerobic life (cellular respiration). Some colonies are important in nitrogen fixation, making atmospheric nitrogen (N2) available for organic compounds.
Good morning and thank you, Cyanobacteria.
by wtfitsshiny November 13, 2011
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.