also: ちちくび
Refers to the nipple of a human or animal. Neutral in register, used in everyday and medical contexts.
赤ちゃんが乳首を吸っている。
The baby is sucking on the nipple.
授乳中に乳首が痛くなることがある。
Nipples can become sore during breastfeeding.
My nipple hurts from breastfeeding the baby.
My nipples became erect from the cold.
The baby is touching its own nipple.
Kana spelling used in informal or explanatory contexts.