‖Pyc′no‐don″ti‐ni (?), n. pl.(Zoöl.) An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.