Source : Webster's Revised Unabridged Dictionary (1913)

Combinable \Com*bin"a*ble\, a. [Cf. F. combinable.]
   Capable of combining; consistent with. [R.] --M. Arnold. --
   {Com*bin"a*ble*ness}, n.

Source : WordNet®

combinable
     adj : able to or tending to combine [syn: {combinational}, {combinatory}]