1. (n.pl.) The narrow passage from the mouth to the pharynx, situated between the soft palate and the base of the tongue; -- called also the isthmus of the fauces. On either side of the passage two membranous folds, called the pillars of the fauces, enclose the tonsils.
2. (n.pl.) The throat of a calyx, corolla, etc.
3. (n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.