levorotatory

(-rōtə tôr′ē)

adjective

  1. turning or circling to the left, in a counterclockwise direction
  2. that turns the plane of polarized light counterclockwise: said of certain crystals, etc.

Origin: levo- + rotatory

See levorotatory in American Heritage Dictionary 4

adjective 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.

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