Definitions

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

  • n. Any of various yellow-green algae that live symbiotically within the cells of other organisms, such as those of certain radiolarians and marine invertebrates.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

Etymologies

New Latin : zoo- + xanth(o)- + -ella, diminutive suff.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ζῷον (zōon, "animal") + ξανθός (ksanthos, "yellow") (Wiktionary)

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