From The Collaborative International Dictionary of English v.0.44 [gcide]:
Levorotatory \Le'vo*ro"ta*to*ry\ (-r[=o]"t[.a]*t[-o]*r[y^]), adjective [Levo- + rotatory.] (Chem. & Physics) Turning or rotating the plane of polarization of light towards the left; -- applied to crystals and compounds exhibiting optical activity, such as levulose, left-handed quartz crystals, etc. Opposite of {dextrorotatory}. [Written also {l[ae]vorotatory}.] [1913 Webster +PJC]
From WordNet (r) 2.0 [wn]:
adjective
1: rotating to the left [syn: {levorotary}, {left-handed}]
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