diquat

noun di·quat \ ˈdī-ˌkwät \

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

Recent Examples of diquat from the Web

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.

— hector argüello canals, National Geographic, "A Green Way to Clean Ponds," 17 June 2016
Duckweed and watermeal are just two types of weeds that most pond owners seek to control with chemicals such as diquat.

— hector argüello canals, National Geographic, "A Green Way to Clean Ponds," 17 June 2016

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.