levorotation

/ˌliːvəroʊˈteɪʃən/
noun
  1. Rotation or turning to the left, especially of the plane of polarized light in chemistry.
    • The chemist measured the levorotation of the sugar solution.
    • In the lab, we observed levorotation when the light passed through the sample.
    • Levorotation is a key property used to identify certain organic compounds.