Noun
diquat (countable and uncountable, plural diquats)
(organic chemistry) A contact herbicide that produces desiccation and defoliation.
Bipyridine compounds (Paraquat-Gramoxone and Diquat) were discovered for herbicide use in 1954 by William Boon at ICI's Plant Protection division at Jealott's Hill, being released onto the market in 1958. Source: Internet