diquat

American  

[dahy-kwot] / ˈdaɪ kwɒt /

noun

1. a yellow crystalline substance, C 12 H 12 Br 2 N 2 , used as a selective postemergence herbicide to control weeds on noncrop land and for aquatic weed control.

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Etymology

Origin of diquat

First recorded in 1955–60; di- ¹ + quat(ernary)

Example Sentences

Home-use Roundup products found in many hardware and garden stores have been reformulated without glyphosate and may contain ingredients such as triclopyr, fluazifop, and diquat.

From Science Daily • Jun. 23, 2026

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.

From National Geographic

Duckweed and watermeal are just two types of weeds that most pond owners seek to control with chemicals such as diquat.

From National Geographic