n. | 1. the branch of biology that deals with the internal workings of living things, including functions such as metabolism, respiration, and reproduction, rather than with their shape or structure 2. the way a particular body or organism works 3. the science that deals with the way that the bodies of living things operate 4. the way that the body of a particular living thing operates 1. the branch of biology that deals with the internal workings of living things, including functions such as metabolism, respiration, and reproduction, rather than with their shape or structure 2. the way a particular body or organism works 3. the science that deals with the way that the bodies of living things operate 4. the way that the body of a particular living thing operates |