(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, inclose the tonsils.

(2):

(n.pl.) The throat of a calyx, corolla, etc.

(3):

(pl.) of Faux

(4):

(n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.