a combining form meaning “left, on the left,” used in the formation of compound words: sinistrodextral.

< Latin sinistr-, stem of sinister (see sinister) + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

sinistro- or sinistr-

  1. Left: sinistral.

  2. Levorotatory: sinistrotorsion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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