zooxanthella

Etymology
From (deprecated) genus name, from +  +.

Noun

 * 1)  Any of the yellow pigmentary particles, or minute corpuscles of yellow coloring matter, found in certain radiolarians.
 * 2) Any of various typically yellow-brown dinoflagellates (originally grouped as genus ) now assigned to the genera  and, notably found in coral reefs.

Derived terms

 * zooxanthellal