noun, noun which may take the genitive case particle 'no'
Anatomical term for the nipple or teat of a mammary gland. Often used in medical or biological contexts. The more common everyday word is 乳首 (ちくび).
See also: 乳頭 (にゅうとう)
The shape of the nipple varies from person to person.
Inflammation is observed in the nipple area.