anorthicadj.
Crystallogr.
Irregular in crystallization; applied to all crystals which do not fall under one of the more regular systems; called also doubly oblique, triclinic, tetartoprismatic.
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anorthic1864
1864 Reader 438/2 That the crystals included in the oblique and anorthic systems are formed by the combination of hemihedral and tetartohedral forms of the prismatic system.
1869 J. Phillips Vesuvius x. 276 The sixth system, called anorthic, or doubly oblique, has its three axes unequal, and neither of them perpendicular to another.
This entry has not yet been fully updated (first published 1884; most recently modified version published online March 2011).
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adj.1864