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sinistro-

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

< Latin sinistr-, stem of sinister (see sinister) + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sinistro- in Medicine

sinistro-

pref.
  1. Left:sinistral.
  2. Levorotatory:sinistrotorsion.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.