The Collaborative International Dictionary
Pycnodont
Pycnodont \Pyc"no*dont\, n. [Gr. ? thick, crowded + ?, ?, a tooth.] (Paleon.) Any fossil fish belonging to the Pycnodontini. They have numerous round, flat teeth, adapted for crushing.
Wiktionary
pycnodont
n. (context zoology English) Any of the extinct oyster genus (taxlink Pycnodonte genus noshow=1).