The Collaborative International Dictionary of English v.0.48:

Dextrorotatory \Dex`tro*ro"ta*to*ry\, a. [Dextro- + rotatory.]
   (Chem. & Opt.)
   Turning, or causing to turn, toward the right hand; esp.,
   turning the plane of polarization of luminous rays toward the
   right hand; as, dextrorotatory crystals, sugars, etc. Cf.
   Levorotatory. Dextrorsal

WordNet (r) 3.0 (2006):

dextrorotatory
    adj 1: rotating to the right [syn: dextrorotary,
           dextrorotatory, right-handed]