refringent

from The Collaborative International Dictionary of English v.0.48

Refringent \Re*frin"gent\ (-jent), a. [L. refringens, p. pr. of
   refringere. See {Refract}.]
   Pertaining to, or possessing, refringency; refractive;
   refracting; as, a refringent prism of spar. --Nichol.
   [1913 Webster]