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The Collaborative International Dictionary
laevorotation

Levorotation \Le`vo*ro*ta"tion\, n. [Written also l[ae]vorotation.] [Levo- + rotation.] (Physics & Chem.) Rotation in the direction of an outgoing right-handed screw; counter-clockwise rotation; -- applied chiefly to the turning of the plane of polarization of light.

Wiktionary
laevorotation

n. (alternative form of levorotation English)