1. The small projection of a mammary gland
   "The nipple becomes more pronounced during pregnancy";
   - mammilla, mamilla, pap [dialect], teat
    
2. A flexible cap on a baby's feeding bottle or pacifier
   "He checked that the nipple was securely attached to the bottle"
    
3. A small protrusion on a device, esp. one through which liquids can be passed in a regulated manner
   "The baby bottle had a soft silicone nipple"
    
4. A short pipe with a screw thread at both ends, used as a connector
   "The plumber used a nipple to join the two sections of pipe"

Derived forms: nipples

Type of: cap, reproductive organ, sex organ

Part of: bottle, feeding bottle, mamma, mammary gland, nursing bottle

Encyclopedia: Nipple