As a Noun: 1. The two soft, round pieces of flesh on a woman's chest that can produce milk to feed a baby. English = breast, breasts, bosom. 2. Of a woman, the feeding of a baby with the milk from her breasts, rather than a bottle. English = breastfeeding. As a Verb or Adjective: 1. Of a woman, to feed a baby with the milk from her breasts, rather than from a bottle. English = breastfeed.