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Definition of Optical activity
1. Noun. (physics) a property caused by asymmetrical molecular or crystal structure that enables a compound or crystal to rotate the plane of incident polarized light ¹
2. Noun. (chemistry) A measure of the amount of optical rotation produced by a standard amount of a substance ¹
¹ Source: wiktionary.com
Medical Definition of Optical activity
1. The ability of a material to rotate the plane of polarized light. (09 Oct 1997)