le·vo·ro·ta·to·ry (lē'və-rō'tə-tôr'ē, -tōr'ē) adj.
Symbol l- Of or relating to an optically active chemical that rotates the plane of polarized light to the left, or counterclockwise: Only levorotatory amino acids are biologically active.
Main Entry: le·vo·ro·ta·to·ry Pronunciation: -'rOt-&-"tOr-E, -"tor- Variants: orle·vo·ro·ta·ry/-'rOt-&-rE/or Britishlae·vo·ro·ta·to·ryorlae·vo·ro·ta·ry Function: adjective : turning toward the left or counterclockwise; especially: rotating the plane ofpolarization of light to the left —compare DEXTROROTATORY