<p><strong>Noun</strong></p><ul><li>Chemistry.</li><li>A salt or ester of nitric acid, or any compound containing the univalent group –ONO₂ or NO₃.</li><li>Fertilizer consisting of potassium nitrate or sodium nitrate.</li><li>Nitrocellulose.</li><li>Informal.</li><li>Nitrate film.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object)</li><li>Nitrated, nitrating.</li><li>To treat with nitric acid or a nitrate.</li><li>To convert into a nitrate.</li></ul>