retrogression

Definitions of retrogression
1

n returning to a former state

Synonyms:
regress, regression, retroversion, reversion
Type of:
reversal
a change from one state to the opposite state

n passing from a more complex to a simpler biological form

Synonyms:
degeneration
Types:
abiotrophy
a loss of vitality and a degeneration of cells and tissues not due to any apparent injury
cataplasia
(biology) degenerative reversion of cells or tissue to a less differentiated or more primitive form
Type of:
shift, transformation, transmutation
a qualitative change

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