BT Ḥul 18b(32) :פגע בחיטי "טריפ׳‏ : (if) he reached the h-cartilages (with the knife) it is terefa
See the entire entry for ḥeṭṯā n.f. nipple

BT Ḥul 18b(32) :פגע ונגע‏ :
See the entire entry for pgˁ vb. to chance upon, happen to