Source : Webster's Revised Unabridged Dictionary (1913)

Transformable \Trans*form"a*ble\, a.
   Capable of being transformed or changed.

Source : WordNet®

transformable
     adj : capable of being changed in substance as if by alchemy; "is
           lead really transmutable into gold?"; "ideas
           translatable into reality" [syn: {convertible}, {translatable},
            {transmutable}]