The Collaborative International Dictionary
Trica
Trica \Tri"ca\, n.; pl. Tric[ae]. [NL.] (Bot.) An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows.
Wiktionary
trica
n. (context lichenology English) An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows.