Glottis
The glottis is defined as the opening between the vocal folds (the rima glottidis).
Epiglottis
The epiglottis is a flap made of elastic cartilage covered with a mucous membrane, attached to the entrance of the larynx. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally. It stands open during breathing, allowing air into the larynx. During swallowing, it closes to prevent aspiration, forcing the swallowed liquids or food to go along the esophagus instead. It is thus the valve that diverts passage to either the trachea or the esophagus.
The epiglottis gets its name from being above the glottis (epi- + glottis). There are taste buds on the epiglottis.
Glottis (noun)
The opening between the true vocal cords, located in the larynx.
Epiglottis (noun)
A cartilaginous organ in the throat of terrestrial vertebrates covering the glottis when swallowing to prevent food and liquid from entering the trachea, and in Homo sapiens also a speech organ.
Glottis (noun)
the part of the larynx consisting of the vocal cords and the opening between them. It affects voice modulation through expansion or contraction.
Epiglottis (noun)
a flap of cartilage behind the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.