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x axis[′eks ‚ak·səs]
A reference axis within a quartz crystal.
A horizontal axis in a system of rectangular coordinates.
That line on which distances to the right or left (east or west) of the reference line are marked, especially on a map, chart, or graph.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.