Definitions for optical activity
Random House Webster's College Dictionary
the ability of a substance to rotate the plane of polarization of plane-polarized light.
Origin of optical activity:
a property caused by asymmetrical molecular or crystal structure that enables a compound or crystal to rotate the plane of incident polarized light
A measure of the amount of optical rotation produced by a standard amount of a substance
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"optical activity." Definitions.net. STANDS4 LLC, 2013. Web. 5 Dec. 2013. <http://www.definitions.net/definition/optical activity>.