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meatus

Noun

me=a=tus

WORDNET DICTIONARY

has particulars: acoustic meatus, auditory canal, auditory meatus, ear canal, external auditory canal, nasal meatus

meatus, n. sing. & pl. [L., a going, passage, fr. meare to go.].

A natural passage or canal; as, the external auditory meatus. See Illust. of Ear. [1913 Webster]

meatus, n. (pl. same or meatuses) Anat. a channel or passage in the body or its opening.

Etymology

L, = passage f. meare flow, run

For further exploring for "meatus" in Webster Dictionary Online