teat

noun3

1. •
   The projection of a mammary gland from which, on female therian mammals, milk is secreted.

   • Milk formed their chief diet, and this they were supposed to imbibe from the witch herself, from a third "teat" which had been made beneath the arm by a nip from the Devil's pincers. — 1936
2. •
   Something resembling a teat, such as a small protuberance or nozzle.
3. •
   An artificial nipple used for bottle-feeding infants.