Actually, the Old English word was tit, and it is related to German Zitze, not derived from it. The Middle English word tete is borrowed from the Old French tette which in turn is borrowed from a Germanic language, as are the Italian and some other Romance words, replacing Latin mamilla. (Note that in French, Latin, and Old English, the various words leaned more towards meaning 'nipple' more than 'breast'.

Ceci n'est pas un seing.