earplug

[eer-pluhg]
noun
a plug of soft, pliable material inserted into the opening of the outer ear, especially to keep out water or noise.

Origin:
1900–05; ear1 + plug

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
earplug (ˈɪəˌplʌɡ)
 
n
a small piece of soft material, such as wax, placed in the ear to keep out noise or water

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences for earplugs
This ear material was later developed into commercial memory foam earplugs.
Sometimes earplugs are connected with a cord to keep them together when not in
  use.
Other common material bases for earplugs are viscous wax or silicone.
Some musicians earplugs are custommade for the individual listener.
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