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noun
An earphone that is inserted into the ear canal.
is a specific kind of: earphone, earpiece, headphone, phone.
A plug of cotton, wax, or rubber that is fitted into the ear canal for protection against the entry of water or loud noise.
is a specific kind of: plug, stopper, stopple.
Polish: zatyczka do uszu
Find more on earplug elsewhere: etymology - rhymes - Wikipedia.
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