of, pertaining to, or on the left side; left (opposed to dextral ).
(of certain gastropod shells) coiling counterclockwise, as seen from the apex.

1425–75; late Middle English < Medieval Latin sinistrālis. See sinister, -al1

sinistrally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sinistral (ˈsɪnɪstrəl)
1.  of, relating to, or located on the left side, esp the left side of the body
2.  a technical term for left-handed
3.  (of the shells of certain gastropod molluscs) coiling in a clockwise direction from the apex
[C15 (in the obsolete sense: adverse, evil); C19 (in current senses): from Medieval Latin sinistrālis. See sinister]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sinistral sin·is·tral (sĭn'ĭ-strəl, sĭ-nĭs'trəl)

  1. Of, facing, or located on the left side; left.

  2. Left-handed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
That's great for attacking snails with clockwise dextral shells, but less so for those with anti-clockwise sinistral ones.
It seems probable that a sinistral transform system was developed through this continental bridge.
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