ear canal; external auditory canal
Anatomical term for the passage from the outer ear to the eardrum. Used in medical contexts.
When water gets into the ear canal, hearing can become difficult.
The doctor used an otoscope to examine the ear canal.
内耳 is the inner ear, whereas 外耳道 is part of the outer ear.
Compound of 外 (outside) + 耳 (ear) + 道 (passage). The reading is on'yomi, as expected for a technical anatomical term.