blue-green algae

/B L UW1 G R IY0 N AE0 L JH IY0/
noun
  1. 1

    Any member of the taxonomic class or phylum Cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere.

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Source: https://en.wiktionary.org/wiki/blue-green%20alga, https://en.wiktionary.org/wiki/blue-green%20algae