- noun the conversion of organic matter into simpler chemical compounds, as in the production of biogas from manure.
- The processes which take place in the stomach and bowels whereby food is broken down into small molecules which can be absorbed into the blood and transported round the body for use. The process makes use of acid, enzymes and emulsifying agents secreted into the mouth, stomach and bowel and of microorganisms in the gut which convert food into other compounds necessary for health.
- noun the process by which food is broken down in the alimentary canal into components which can be absorbed by the body
- noun the act of breaking down food in the stomach and intestine and converting it into elements that can be absorbed by the body