• (n. pl.) An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales.
Pyc`no·don'ti·ni noun plural [ New Latin ] (Zoology) An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs ( pleurolepida ) and with enameled rhomboidal scales.