diquat

[dahy-kwot]
noun
a yellow crystalline substance, C 12 H 12 Br 2 N 2 , used as a selective postemergence herbicide to control weeds on noncrop land and for aquatic weed control.

Origin:
1955–60; di-1 + quat(ernary)

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Diquat concentrations in chambers without sediment remained constant.
Diquat dibromide is registered for both terrestrial and aquatic uses.
Diquat binds tightly to clay particles and is not effective in muddy water or on mud-coated weeds.
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