Source : Webster's Revised Unabridged Dictionary (1913)

Bordeaux mixture \Bor*deaux" mix"ture\ (Hort.)
   A fungicidal mixture composed of blue vitriol, lime, and
   water. The formula in common use is: blue vitriol, 6 lbs.;
   lime, 4 lbs.; water, 35 -- 50 gallons.

Source : WordNet®

Bordeaux mixture
     n : antifungal agent consisting of a solution of copper sulphate
         and quicklime