Diquat Definition
dīkwät
noun
A toxic nonpersistent strong contact herbicide, C12 H12 N2 , usually formulated as its yellow crystalline dibromide salt.
American Heritage
(organic chemistry) A contact herbicide that produces desiccation and defoliation.
Wiktionary
Origin of Diquat
di– quat(ernary)
From American Heritage Dictionary of the English Language, 5th Edition