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diquat

[dahy-kwot] /ˈdaɪ kwɒt/
noun
1.
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 of diquat
1955-1960
First recorded in 1955-60; di-1 + quat(ernary)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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