Webster's English Dictionary

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levorotatory

Cross references:
  1. dextrorotatory        
 
le.vo.ro.ta.to.ry or le.vo.ro.ta.ry \-'ro-t-*-.to-r-e-, -.to.r-\ 
   \-'ro-t-*-re-\ aj : turning toward the left or counterclockwise; esp : 
   rotating the  plane of polarization of light to the left