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blue-green alga


from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See cyanobacterium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any member of the cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere.

from the GNU version of the Collaborative International Dictionary of English

  • any of a group of photosynthetic microorganisms possessing characteristics of both bacteria and plants. When classed as bacteria, they are assigned to the Cyanobacteria; when classed as plants, they are assigned to the Cyanophyta. They are now known to be prokaryotic, and are usually called cyanobacteria in technical contexts. See cyanobacterium.


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