The Collaborative International Dictionary of English v.0.48:

Resistible \Re*sist"i*ble\ (r?-z?st"?-b'l), a. [Cf. F.
   r['e]sistible.]
   Capable of being resisted; as, a resistible force. --Sir M.
   Hale. -- Re*sist"i*ble*ness, n. -- Re*sist"i*bly, adv.
   [1913 Webster]