1. chemistry chemical group: a salt or an ester of nitric acid
2. agriculture fertilizer: a fertilizer that consists of sodium nitrate, potassium nitrate, or ammonium nitrate
transitive verb (past and past participleni·trat·ed, present participleni·trat·ing, 3rd person present singularni·trates)
Definition:
chemistry industry use nitrate on something: to treat something with a nitrate or nitric acid, usually in order to change an organic compound into a nitrate