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"
preferring to use left foot or hand or eye; "sinistral individuals exhibit dominance of the left hand and eye"
opposite of dextral; coiled in a left-handed spiral; the aperture is on the left side of the shell when viewed with the apex up
anti-clockwise displacement of the compartments along a fault.