Levo-
Pronunciation : Le"vo-.
Definition : Defn: A prefix from L. laevus, meaning: (a) Pertaining to, or toward, the left; as, levorotatory. (b) (Chem. & Opt.) Turning the plane of polarized light to the left; as, levotartaric acid; levoracemic acid; levogyratory crystals, etc. [Written also l?vo-.]
Source : Webster's Unabridged Dictionary, 1913