dex·tro·ro·ta·to·ry 
(dĕk′strə-rōtə-tôr′ē) also dex·tro·ro·ta·ry (-rōtə-rē)
(dĕk′strə-rōtə-tôr′ē) also dex·tro·ro·ta·ry (-rōtə-rē)adj. Symbol d-
Of or relating to an optically active substance that rotates the plane of polarized light to the right, or clockwise (when looking toward the light source): a dextrorotatory solution.