Definition of hypermutant in English:

hypermutant

Pronunciation /ˌhʌɪpəˈmjuːt(ə)nt/

noun

Genetics
  • An organism or gene sequence that undergoes or has undergone mutation at a high rate.

adjective

Genetics
  • That undergoes or has undergone mutation at a high rate.

Origin

1930s (in an earlier sense). From hyper- + mutant, after hypermutation.