"You canker blossom!" 3 Shakespearean Insults
degeneration de·gen·er·a·tion (dĭ-jěn'ə-rā'shən)
The gradual deterioration of specific tissues, cells, or organs with impairment or loss of function, caused by injury, disease, or aging.
The evolutionary decline or loss of a function, characteristic, or structure in an organism or a species.