The Collaborative International Dictionary of English v.0.48:

Parachrose \Par"a*chrose\ (p[a^]r"[.a]*kr[=o]s), a. [Gr.
   para`chrwsis false coloring; para` beside, beyond + chrw`s
   color.] (Min.)
   Changing color by exposure --Mohs.
   [1913 Webster]