The Collaborative International Dictionary
Idiophanous
Idiophanous \Id`i*oph"a*nous\, a. [Idio- + ? to appear.] (Crystallog.) Exhibiting interference figures without the aid of a polariscope, as certain crystals.
Wiktionary
idiophanous
a. (context crystallography English) Exhibiting interference figures without the aid of a polariscope, as certain crystals do.