What is turning or rotating the plane of polarization towards the left; levogyrate, as levulose, left handed quartz crystals, etc. [Written also lævorotatory.] called?

levorotatory — Turning or rotating the plane of polarization towards the left; levogyrate, as levulose, left handed quartz crystals, etc. [Written also lævorotatory.]. (Webster's 1913.)

Sources