Milk (milk juice) — as in cow's milk or breast milk; liquid produced for feeding.
このチーズは牛の乳から作られている。
This cheese is made from cow's milk.
赤ちゃんに十分な乳を与えることが大切だ。
It's important to give the baby enough milk.
乳製品は冷蔵庫で保存する。
Dairy products should be stored in the refrigerator.
Breast; the breast/chest area of the body.
乳がんの検診を定期的に受けたほうがいい。
It's better to have regular screenings for breast cancer.
授乳期は乳が張って痛むことがある。
During breastfeeding, the breasts can become engorged and painful.
A loop; a ring-like part — a specialized or archaic sense (limited technical usage).
古い鎖の乳（ち）は小さな輪のように残っていた。
The loop (乳) on the old chain remained like a small ring.
A decorative bump or boss on a hanging bell (such as a Buddhist temple bell).
この梵鐘の乳は円形で一つ一つ丁寧に彫られている。
The bosses on this temple bell are circular and each is carefully carved.