‖Prop′te‐ryg″i‐um (?), n.; pl.Propterygia (#). (Anat.) The anterior of three principal cartilages in the fins of some fishes. — Prop′ter‐yg″i‐al (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.