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sinistrogyration

(sĭn′ĭ-strō-jī-rāshən)
n.
  1. A twisting to the left, as of a plane of polarized light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.