<p><strong>Noun</strong></p><ul><li>A substance produced by or used in a chemical process.</li><li>Chemicals, Slang: narcotic or mind-altering drugs or substances.</li></ul><p><strong>Adjective</strong></p><ul><li>Of, used in, produced by, or concerned with chemistry or chemicals: a chemical formula; chemical agents.</li><li>Used in chemical warfare: chemical weapons.</li></ul>