Dictionary![]() ![]() ni•tratePronunciation: ( —n.nī'trāt, -trit; —v.nī'trāt), [key] —n., v., -trat•ed, -trat•ing. —n. 1. Chem.a salt or ester of nitric acid, or any compound containing the univalent group –ONO2 or NO3. 2. fertilizer consisting of potassium nitrate or sodium nitrate. 3. cellulose nitrate, a substance used as a film base in the early days of filmmaking. 4. Informal.See nitrate film. —v.t. 1. to treat with nitric acid or a nitrate. 2. to convert into a nitrate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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