teat

Short definition from Wiktionary

Noun

1. 1
   The projection of a mammary gland from which, on female therian mammals, milk is secreted.
2. 2
   Something resembling a teat, such as a small protuberance or nozzle.
3. 3
   An artificial nipple used for bottle-feeding infants.

Proper noun

1. 1
   A surname from German.