A salt of nitric acid.
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ni·trate 'nī-.trāt, -trət n a salt or ester of nitric acid
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ni·trate (niґtrāt) any salt or ester of nitric acid or the NO3− anion; organic nitrates, e.g., nitroglycerin, are used as coronary vasodilators in the treatment of angina pectoris.Medical dictionary. 2011.