[sahy-uh-noh-bak-teer-ee-uh, sahy-an-oh-]
plural noun, singular cyanobacterium [sahy-uh-noh-bak-teer-ee-uhm, sahy-an-oh-] . Biology.
blue-green algae.

1975–80; cyano-1 + bacteria Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cyanobacteria (ˌsaɪənəʊbækˈtɪərɪə)
pl n , sing -rium
Former name: blue-green algae a group of photosynthetic bacteria (phylum Cyanobacteria) containing a blue photosynthetic pigment

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

Cyanobacteria Cy·a·no·bac·te·ri·a (sī'ə-nō-bāk-tēr'ē-ə)
A group of Procaryotae consisting of unicellular or filamentous gram-negative microorganisms that are either nonmotile or possess a gliding motility, may reproduce by binary fission, and photosynthetically produce oxygen; some species capable of fixing nitrogen. Members of this phylum were formerly called blue-green algae.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cyanobacterium   (sī'ə-nō-bāk-tîr'ē-əm)  Pronunciation Key 
Plural cyanobacteria
Any of a phylum of photosynthetic bacteria that live in water or damp soil and were once thought to be plants. Cyanobacteria have chlorophyll as well as carotenoid and phycobilin pigments, and they conduct photosynthesis in membranes known as thylakoids (which are also found in plant chloroplasts). Cyanobacteria may exist as individual cells or as filaments, and some species live in colonies. Many species secrete a mucilaginous substance that binds the cells or filaments together in colored (often bluish-green) masses. Cyanobacteria exist today in some 7,500 species, many of which are symbiotes, and have lived on Earth for 2.7 billion years. Since all species produce oxygen as a byproduct of metabolism, it is thought that much of Earth's atmospheric oxygen can be attributed to cyanobacteria. Many species can also fix nitrogen and so play an important role in the nitrogen cycle. Also called blue-green alga.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for cyanobacterium
Each individual cell of a cyanobacterium typically has a thick, gelatinous cell wall.
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