teat

From Middle English tete, from Old French tete (“teat”) (compare French tette), from Frankish *tittā, *tittō, from Proto-Germanic *tittaz (“teat; nipple; breast”), ultimately of expressive origin. Compare Old High German zizza ("teat"; modern German Zitze), whence also Italian zizza (“teat”). It heavily displaced Old English titt, a cognate of the same origin, which survives as tit, but in more vulgar use. Compare Dutch tiet and German Zitze (“teat”).

出典: Wiktionary「teat」（CC BY-SA 4.0）