Etymology
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sinistral (adj.)

late 15c., "unlucky," from Old French senestral, sinistral or Medieval Latin *sinistralis, from Latin sinister "left, on the left side" (see sinister). Meaning "on the left side" is from 1803. Related: Sinistrally.

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Definitions of sinistral

sinistral (adj.)
of or on the left;
a sinistral gastropod shell with the apex upward has its opening on the left when facing the observer
a sinistral flatfish lies with the left eye uppermost
From wordnet.princeton.edu