aerator

[air-ey-ter, ey-uh-rey-]
noun
1.
an apparatus for aerating water or other fluids.
2.
a device for introducing air into a bin of wheat or other grain in order to prevent the accumulation of moisture, keeping it free of fungi and insects.

Origin:
1860–65; aerate + -or2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
aerate (ˈɛəreɪt)
 
vb
1.  to charge (a liquid) with a gas, esp carbon dioxide, as in the manufacture of effervescent drink
2.  to expose to the action or circulation of the air, so as to purify
 
aer'ation
 
n
 
'aerator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Make your kitchen faucet more green by restricting water flow with an aerator.
The aerator compressor must be installed in a well ventilated, relatively clean
  and dry location.
One such mechanical treatment used by a rancher involves the use of an aerator.
When replacing an aerator, bring the one you're replacing to the store with you
  to ensure a proper fit.
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