Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various yellow-brown photosynthetic dinoflagellates that live symbiotically within the cells of other organisms, especially certain corals and other marine invertebrates.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An animal of the genus Symbiodinium, a yellow dinoflagellate, notably found in coral reefs.
  • noun dated Any golden-brown planktonic endosymbiont.

Etymologies

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

[New Latin : zoo– + xanth(o)– + -ella, diminutive suff.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ζῷον (zōon, "animal") + ξανθός (ksanthos, "yellow")

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