The Collaborative International Dictionary of English v.0.48:

Refrangible \Re*fran"gi*ble\ (-fr?n"j?*b'l), a. [Cf. F.
   r['e]frangible. See Refract.]
   Capable of being refracted, or turned out of a direct course,
   in passing from one medium to another, as rays of light. --
   Re*fran"gi*ble*ness, n.
   [1913 Webster]