<p><strong>Adjective</strong></p><ul><li>tending to cause irritation; irritating.</li></ul><p><strong>Noun</strong></p><ul><li>anything that irritates.</li><li>Physiology, Pathology: a biological, chemical, or physical agent that stimulates a characteristic function or elicits a response, especially an inflammatory response.</li></ul><p><strong>End of Response</strong></p>