optical rotation

noun Physical Chemistry.
the angle at which the plane of polarized light is rotated when passed through an optically active substance.

Origin:
1890–95

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World English Dictionary
optical rotation
 
n
the angle through which plane-polarized light is rotated in its passage through a substance exhibiting optical activity

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

optical rotation n.
The change or rotation in the plane of polarization that occurs when polarized light is passed through an optically active substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Differences in optical rotation may also correlate to profound differences in the response of the human body to a compound.
Some of them may hydrolyze, but that will not even be obvious without measuring optical rotation.
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