also: にゅうぼう
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.
The baby is sucking at its mother's breast.
The cow's udder is swollen.
Before nursing, her breasts were engorged and painful.
The doctor palpated the breast to check for any abnormalities.
Apparently, milk supply isn't related to breast size.