Source : Webster's Revised Unabridged Dictionary (1913)

Anorthic \A*nor"thic\, a. [See {Anorthite}.] (Min.)
   Having unequal oblique axes; as, anorthic crystals.

Source : WordNet®

anorthic
     adj : having three unequal crystal axes intersecting at oblique
           angles; "triclinic system" [syn: {triclinic}] [ant: {monoclinic}]