pterygopodium

‖n.; pl. Pterygopodia [ NL., fr. Gr. &unr_;, &unr_;, a fin + &unr_;, dim. of &unr_;, &unr_;, a foot. ] (Anat.) A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper. [ 1913 Webster ]