glottis

This term refers specifically to the anatomical gateway of the larynx. It encompasses both the physical tissue of the vocal folds and the actual gap between them, serving as the primary valve for regulating airflow and protecting the airway during deglutition. As a specialized medical and biological term, it is used almost exclusively in clinical, linguistic, or anatomical contexts. It is a singular anatomical structure, though in a general biological sense, it is treated as a standard countable noun.