‖Pter′y‐go‐po″di‐um (?), n.; pl.Pterygopodia (#). (Anat.) A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.