glottis,pl. glottises, glottides [Gk, opening to larynx] , 1. true glottis; a slitlike opening between the true vocal cords (plica vocalis). Also called rima glottidis, true glottis. 2. the phonation apparatus of the larynx, composed of the true vocal cords and the opening between them (rima glottidis). −glottic, glottal, adj.
