The Collaborative International Dictionary of English v.0.48:

Dextrorotary \Dex`tro*ro"ta*ry\, a. (Physics & Chem.)
   See Dextrotatory.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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