The Collaborative International Dictionary
Degenerationist
Degenerationist \De*gen`er*a"tion*ist\, n. (Biol.) A believer in the theory of degeneration, or hereditary degradation of type; as, the degenerationists hold that savagery is the result of degeneration from a superior state.
Wiktionary
degenerationist
n. (context biology English) A believer in the theory of degeneration, or hereditary degradation of type.