1 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" [ant: dextral]
2 preferring to use left foot or hand or eye; "sinistral individuals exhibit dominance of the left hand and eye"
The terms sinistral and dextral refer to the horizontal movement of blocks on either side of a fault or the sense of movement within a shear.;Dextral or right lateral movement: Movement is dextral (right handed) if the block on the other side of the fault moves to the right, or if straddling the fault the right side moves toward the observer.
Naming originSinistral gains its origins from the Latin "sinister" for left-handed. The opposite sense of movement dextral gains its name from the Latin "dexter" for right-handed.
Identifying sense of throwIdentifying the sense of throw of a fault or the sense of shear can be achieved via several methods:
backhand, backhanded, circuitous, counterclockwise, deflectional, deviant, deviative, devious, digressive, divagational, divergent, excursive, indirect, larboard, left, left-hand, left-handed, left-wing, left-wingish, levorotatory, liberal, near, nigh, oblique, port, radical, side, sidelong, sinister, sinistrocerebral, sinistrocular, sinistrogyrate, sinistromanual, sinistrorse, southpaw