- bay opening - Embouchure - Oral cavity - Scowl - The opening through which an animal receives food; the
aperture between the jaws or between the lips; also, the cavity,
containing the tongue and teeth, between the lips and the pharynx; the
buccal cavity. - An opening affording entrance or exit; orifice; aperture; - The opening of a vessel by which it is filled or emptied,
charged or discharged; as, the mouth of a jar or pitcher; the mouth of
the lacteal vessels, etc.