Webster's English Dictionary

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teat

teat \'tit, 'te-t\ n [ME tete, fr. OF, of Gmc origin; akin to OE tit teat, 
   MHG zitze)X 1: the protuberance through which milk is drawn from an udder 
   or breast :  NIPPLE 2: a small projection or a nib (as on a mechanical 
   part)