[teet, tit]
the protuberance on the breast or udder in female mammals, except the monotremes, through which the milk ducts discharge; nipple or mammilla.
something resembling a teat.

1250–1300; Middle English tete < Old French < Germanic; see tit2

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World English Dictionary
teat (tiːt)
1.  a.  the nipple of a mammary gland
 b.  See nipple (in cows, etc) any of the projections from the udder through which milk is discharged
2.  something resembling a teat in shape or function, such as the rubber mouthpiece of a feeding bottle
[C13: from Old French tete, of Germanic origin; compare Old English titt, Middle High German zitze]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-13c., from O.Fr. tete "teat" (12c.), from P.Gmc. *titta (source of O.E. titt, see tit).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

teat (tēt, tĭt)

  1. See nipple.

  2. The female breast; mamma.

  3. A papilla.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
teat   (tēt, tĭt)  Pronunciation Key 
A small projection near the center of the mammary gland of many female mammals that contains the outlet of the milk ducts. Each teat contains a single milk duct, while nipples each contain more than one.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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