Definitions
1.NounThe process or state of growing worse, or the state of having become worse.
2.NounThat condition of a tissue or an organ in which its vitality has become either diminished or perverted; a substitution of a lower for a higher form of structure."fatty degeneration of the liver"
3.NounGradual deterioration, from natural causes, of any class of animals or plants or any particular organ or organs; hereditary degradation of type.
4.NounA thing that has degenerated.