Source : Webster's Revised Unabridged Dictionary (1913)

Gonidium \Go*nid"i*um\, n.; pl. {Gonidia}. [NL., fr. Gr. ? that
   which generates.] (Bot.)
   A component cell of the yellowish green layer in certain
   lichens.

Source : WordNet®

gonidia
     See {gonidium}