RhymeZone: gonidium definitions

Definitions of gonidium:

noun: (lichenology, phycology) A photosynthetic algal cell in the thallus of a lichen; a similar asexual reproductive cell in some algae.
noun: (zoology) A special groove or furrow at one or both angles of the mouth of many Anthozoa.

(Definitions from Wiktionary)