Nipple
01
乳首, おしゃぶり
a flexible rubber or silicone cap attached to a baby's feeding bottle or pacifier through which the child sucks liquid or air
例
The baby refused the bottle because the nipple was too firm.
赤ちゃんは乳首が硬すぎたので哺乳瓶を拒否しました。
乳首, おしゃぶり