basal orientation

basal orientation

[′bā·səl ‚ȯr·ē·ən′tā·shən]
(crystallography)
A crystal orientation in which the surface is parallel to the base of the lattice or to the lattice plane which is normal to one of the lattice axes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.