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.
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
Sinhalese
Sinic
sinical
Sinicism
sinister
sinistral
sinistrorse
sink
sinker
sinkhole
sinless
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