Cough: A sudden, audible expulsion of air from the lungs through a partially closed glottis, preceded by inhalation. It is a protective response that serves to clear the trachea, bronchi, and/or lungs of irritants and secretions, or to prevent aspiration of foreign materials into the lungs.
Source: MeSH Thesaurus
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Source: Search filters for MEDLINE in Ovid syntax and the PubMed translation. HIRU, McMaster University