diquat

[ dahy-kwot ]
/ ˈdaɪ kwɒt /

noun

a yellow crystalline substance, C12H12Br2N2, used as a selective postemergence herbicide to control weeds on noncrop land and for aquatic weed control.

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Origin of diquat

First recorded in 1955–60; di-1 + quat(ernary)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020