Definition from Wiktionary, the free dictionary
From Bordeaux in France, where it is used on vines
- A mixture of copper sulphate and lime that is sprayed on plants as a fungicide.
- 1891 Reports are coming to hand from a very large number of districts as to the success which has attended the use of the Bordeaux mixture (sulphate of copper and lime) as a preventive of potato disease. The Times Nov 16, 1891 pg 12 col A
copper sulphate and lime mixture