The Collaborative International Dictionary
Powerable
Powerable \Pow"er*a*ble\, a.
Capable of being effected or accomplished by the application of power; possible. [R.]
--J. Young.Capable of exerting power; powerful.
--Camden.
Wiktionary
powerable
a. 1 Capable of being powered. 2 (cx obsolete English) Capable of being effected or accomplished by the application of power; possible. 3 (cx obsolete English) Capable of exerting power; powerful.