noun
a passage or opening leading to the eardrum in the human ear, also known as the ear canal
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The acoustic meatus is the opening in the ear that leads to the ear canal.
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I think I may have something stuck in my acoustic meatus, it's been bothering me all day.
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Don't stick anything in your acoustic meatus, you could damage your eardrum.
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His words entered my mind like sound waves through an acoustic meatus, leaving a lasting impact.