meatus (mee-ay-tŭs) n. (in anatomy) a passage or opening. external auditory m. the auditory canal: the passage leading from the pinna of the outer ear to the eardrum. nasal m. one of three groovelike parts of the nasal cavity beneath each of the nasal conchae. urethral m. the external opening of the urethra.
meatus A small canal or passage in the body. An example is the external auditory meatus of the outer ear in mammals, which connects the exterior opening to the eardrum.
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