As a Noun: 1. One of the pieces of flesh that stick out on the chest or stomach of a female animal and from which its babies suck milk. English = teat, nipple. 2. A piece of rubber or plastic that is shaped like a teat and is fitted to a bottle so that a baby can suck liquids from it. English = teat. As a Verb or Adjective: 1. Of a baby, to suck milk from its mother's breast or from a bottle fitted with a teat. English = suckle.