The Collaborative International Dictionary of English v.0.48:

levorotary \le`vo*ro"ta*ry\ (-r[=o]"t[.a]*r[y^]), a. [Levo- +
   rotary.] (Chem. & Physics)
   Same as levorotatory.
   [PJC]

WordNet (r) 3.0 (2006):

levorotary
    adj 1: rotating to the left [syn: levorotary, levorotatory,
           left-handed]