sinistral🔊adj1Of, facing, or on the left side.2Left-handed.3Biology, Natural sciences, Zoology Of certain spiral shells Having the whorls of the spire revolving or rising to the left; reversed.4Geography, Geology, Natural sciences Having left lateral fault movement.SynonymssinistrousAntonymsdextralDerived termsdextrosinistral, sinistral fault, sinistral fold, sinistrality, sinistrallyRelated termssinister