1. A turning or twisting to the left; in particular, the counterclockwise twist given the plane of plane-polarized light by solutions of certain optically active substances. Cf.:dextrorotation. 2. SYN: sinistrotorsion. [levo- + L. roto, to turn]
* * *
le·vo·ro·ta·tion or Brit lae·vo·ro·ta·tion .lē-və-rō-'tā-shən n left-handed or counterclockwise rotation used of the plane of polarization of light
* * *
le·vo·ro·ta·tion (le″vo-ro-taґshən) a turning to the left.Medical dictionary. 2011.