1. the small projection on the breast or chest through which milk is discharged in female mammals
2. a rubber or plastic cap with a small hole, used on a baby’s bottle for feeding
3. a small projection or fitting resembling a nipple in shape or function
Usage: technical

Examples

• The mother cat’s nipples became more prominent as she prepared to nurse her kittens.
• Make sure the bottle nipple has the right flow rate for your baby’s age.
• The mechanic replaced the grease nipple on the machinery.
• She bought new bottle nipples at the baby store.
• The veterinarian examined the dog’s nipples during the checkup.
• The nipple on the baby bottle was cracked and needed replacement.