devolvable

Etymology tree
Proto-Indo-European *de
Proto-Indo-European *-h₁
Proto-Indo-European *déh₁
Proto-Italic *dē
Latin dē
Latin dē-
Proto-Indo-European *welH-der.
Proto-Italic *wolwō
Latin volvō
Latin dēvolvōbor.
English devolve
Proto-Indo-European *-tḗr
Proto-Indo-European *-dʰlom
Proto-Indo-European *-dʰlis
Proto-Italic *-ðlis
Latin -bilis
Latin -ābilis
Old French -ablebor.
Middle English -able
English -able
English devolvable
From devolve + -able.