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diquat

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WordReference Random House Unabridged Dictionary of American English © 2026

di•quat n.

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

di-¹ + quat(ernary) 1955–60

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