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axial angle[′ak·sē·əl ′aŋ·gəl]
The acute angle between the two optic axes of a biaxial crystal. Also known as optic angle; optic-axial angle.
In air, the larger angle between the optic axes after refraction on leaving the crystal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.