optical anomaly
optical anomaly
[′äp·tə·kəl ə′näm·ə·lē] (physical chemistry)
The phenomenon in which an organic compound has a molar refraction which does not agree with the value calculated from the equivalents of atoms and other structural units composing it.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.