[le.vo.ro.ta.to.ry] or le.vo.ro.ta.ry adj (1873): turning toward the left or counterclockwise; esp: rotating the plane of polarization of light to the left--compare dextrorotatory
LEVOROTATORY
Meaning of LEVOROTATORY in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012