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specific rotation

n. Symbol α
  1. The arc of rotation, expressed in angular degrees, through which the plane of polarized light moves when it is in a light path one decimeter in length passing through a solution containing one gram of a compound per one milliliter water.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.