gonidium
Go*nid"i*um, n. Etym: [NL., fr. Gr. (Zool.) Defn: A special groove or furrow at one or both angles of the mouth of many Anthozoa. Go*nid"i*um, n.; pl. Gonidia. Etym: [NL., fr. Gr. (Bot.) Defn: A component cell of the yellowish green layer in certain lichens.