Webster's English Dictionary

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dextrorotatory

dex.tro.ro.ta.to.ry also dex.tro.ro.ta.ry \-'ro-t-*-.to-r-e-, -.to.r-\ 
   \-'ro-t-*-re-\ aj : turning clockwise or toward the right; esp : rotating 
   the plane  of polarization of light toward the right {~ crystals}