also: にゅうぼう
noun
breast; udder
Refers to the mammary gland of a human or animal. In everyday use, ちぶさ is the standard reading; にゅうぼう is more technical or formal.
赤ちゃんが母親の乳房を吸っている。
The baby is sucking at its mother's breast.
牛の乳房が張っている。
The cow's udder is swollen.
The kanji 乳 (milk) and 房 (chamber, cluster) combine to mean 'milk chamber'. The reading ちぶさ is the native Japanese reading (kun'yomi), while にゅうぼう is the Sino-Japanese reading (on'yomi).