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Definition of nitrate noun from the Oxford Advanced American Dictionary

 

nitrate

 noun
noun
NAmE//ˈnaɪtreɪt//
 
[uncountable, countable] (chemistry)
 
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a compound containing nitrogen and oxygen. There are several different nitrates and they are used especially to make soil better for growing crops We need to cut nitrate levels in water.
See the Oxford Advanced Learner's Dictionary entry: nitrate