the thin, triangular, lidlike piece of cartilage that folds back over the opening of the windpipe during swallowing, thus preventing food, etc. from entering the lungs
nounpl.ep·i·glot·tis·es or ep·i·glot·ti·des(-glŏtˈĭ-dēzˌ)
The thin elastic cartilaginous structure located at the root of the tongue that folds over the glottis to prevent food and liquid from entering the trachea during the act of swallowing.