aLevorotatory(Chem. & Physics) Turning or rotating the plane of polarization of light towards the left; -- applied to crystals and compounds exhibiting optical activity, such as levulose, left-handed quartz crystals, etc. Opposite of dextrorotatory.
Century Dictionary and Cyclopedia
levorotatorySame as levogyrate.
Webster's Revised Unabridged Dictionary
Levo-, + rotatory,
The gums are translucent, amorphous substances, whose solutions in water are levorotatory.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher