Word forms: plural bowels1. countable nounYour bowels are the tubes in your body through which digested food passes from your stomach to your anus.
2. plural nounYou can refer in a polite way to someone getting rid of the waste from their body by saying that they move, open, or empty their bowels.
3. plural nounYou can refer to the parts deep inside something such as the earth, a building, or a machine as the bowels of that thing.
[humorous, or literary] ...deep in the bowels of the earth.
Lyn went off into the dark bowels of the building.