Bordeaux mixture

noun Horticulture.
a fungicide consisting of a mixture of copper sulfate, lime, and water.

1890–95; free translation of French bouillie bordelaise. See boil1, Bordelaise Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Bordeaux mixture
horticulture a fungicide consisting of a solution of equal quantities of copper sulphate and quicklime
[C19: loose translation of French bouillie bordelaise, from bouillir to boil + bordelais of Bordeaux]

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