zooxanthellae

noun
  1. 1

    Any of various typically yellow-brown dinoflagellates (originally grouped as genus Zooxanthella) now assigned to the genera Symbiodinium and Amphidinium, notably found in coral reefs.

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Source: https://en.wiktionary.org/wiki/zooxanthella, https://en.wiktionary.org/wiki/zooxanthellae