Definition of meatus in English:
 meatus
nounPlural meatuses mɪˈeɪtəsmiˈeɪdəs
Anatomy 1A passage or opening leading to the interior of the body.
- 1.1 The passage leading into the ear.
 Example sentencesExamples
-  The external auditory meatus runs as a bony tube to the side of the tympanohyal we cannot see on the left-hand picture.
 -  The apocrine sweat glands are confined to the axillae, areolae of the nipples, the anogenital area, and the external auditory meatus.
 -  This includes the pinna on the side of the head and the external auditory meatus, or ear canal, which terminates at the eardrum.
 -  The glands that produce ear ‘wax’ or cerumen are located in the external auditory meatus.
 -  These may extend to the nasopharynx and they commonly terminate in the area of the external auditory meatus.
 
 
Origin
  
Late Middle English: from Latin, 'passage' from meare 'to flow, run'.