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maleic hydrazide

American  
[muh-lee-ik hahy-druh-zahyd] / məˈli ɪk ˈhaɪ drəˌzaɪd /

noun

Chemistry.
  1. a crystalline compound, C 4 N 2 H 4 O 2 , used as a plant growth inhibitor and weed-killer.


Etymology

Origin of maleic hydrazide

1945–50; maleic ( see maleic acid); hydr- 2 + az- + -ide ( def. )

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