achromatic locus

achromatic locus

[¦ak·rə¦mad·ik ′lō·kəs]
(optics)
A region that includes those points in the chromaticity diagram which represent acceptable reference standards of illumination. Commonly referred to as white light. Also known as achromatic region.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.