Sinistral
Pronunciation : Sin"is*tral
Part of Speech : a.
Definition : 1. Of or pertaining to the left, inclining to the left; sinistrous; - - opposed to dextral.
2. (Zo?l.)
Defn: Having the whorls of the spire revolving or rising to the left; reversed; -- said of certain spiral shells.
Source : Webster's Unabridged Dictionary, 1913