zooxanthella

[zoh-uh-zan-thel-uh]

noun, plural zo·o·xan·thel·lae [zoh-uh-zan-thel-ee] /ˌzoʊ ə zænˈθɛl i/.

any of various symbiotic yellow-green or yellow–brown algae in the cytoplasm of certain radiolarians and marine invertebrates.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019