A passage or channel.
An opening leading to an internal passage in the body, e.g. the urethra or the nasal cavity.
Opening or tunnel through any part of the body (e.g., acoustic meatus, leading from the external ear to the tympanic membrane).
An opening or tunnel that connects internal and external surfaces.
A passage or opening. The external auditory meatus is the passage leading from the pinna of the outer ear to the eardrum. A nasal meatus is one of three groovelike parts of the nasal cavity beneath each of the nasal conchae. The urethral meatus is the opening of the urethra to the exterior.
A term applied to any passage or opening: for example, external auditory meatus the passage from the surface to the drum of the ear.
A broad term denoting an aperture or conduit within the human body.
A canal or passage within the body. Typically, this term pertains to the external auditory meatus, which is the canal located in the outer ear. This canal extends from the outer part of the ear to the eardrum.