Source : Webster's Revised Unabridged Dictionary (1913)

Surmountable \Sur*mount"a*ble\, a. [Cf. F. surmontable.]
   Capable of being surmounted or overcome; superable. --
   {Sur*mount"a*ble*ness}, n.

Source : WordNet®

surmountable
     adj 1: capable of being surmounted or overcome; "situations of
            measurable and surmountable danger" [ant: {insurmountable}]
     2: capable of being surmounted [syn: {climbable}]