a axis[′ā ′ak‚sis]
One of the crystallographic axes used as reference in crystal description, usually oriented horizontally, front to back.
The direction of movement or transport in a tectonite.
The angle that specifies the rotation of a machine tool about the x axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.