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The Collaborative International Dictionary of English v.0.48 (gcide)

Teat \Teat\ (t[=e]t), n. [OE. tete, titte, AS. tit, titt; akin
to LG. & OD. titte, D. tet, G. zitze: cf. F. tette, probably
of Teutonic origin.]
1. The protuberance through which milk is drawn from the
udder or breast of a mammal; a nipple; a pap; a mammilla;
a dug; a tit.
[1913 Webster]

2. (Mach.) A small protuberance or nozzle resembling the teat
of an animal.
[1913 Webster]