Definition of diquat
: a powerful herbicide and plant desiccant C12H12Br2N2 used especially to control aquatic weeds and to desiccate aerial plant parts (as of potatoes) before harvesting
From the M-W Editors
Recent Examples of diquat from the Web
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Duckweed and watermeal are just two types of weeds that most pond owners seek to control with chemicals such as diquat.
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After the use of the chemical diquat, the duckweed turns brown and sinks to the bottom, which can nourish unkilled weeds, effectively making matters worse.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diquat.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of diquat
di- + quaternary
Learn More about diquat
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Britannica.com: Encyclopedia article about diquat
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