a person or thing that aerates; specif., a device for aerating a liquid, or a fumigating device
aerator in American English
(ˈɛəreitər, ˈeiəˌrei-)
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
Word origin
[1860–65; aerate + -or2]This word is first recorded in the period 1860–65. Other words that entered Englishat around the same time include: Paleolithic, big brother, blind spot, metric system, raider
Examples of 'aerator' in a sentence
aerator
I suspect it's to do with calcium deposits building up in the faucet aerator.
Times, Sunday Times (2015)
You can also fit aerator taps and low-flow showerheads which restrict the flow of water without reducing water pressure.
The Sun (2013)
If this sounds like too much effort (or you have a heavy soil), hire a powered lawn-aerator instead.
Times, Sunday Times (2006)
And even if it was the faucet aerator, there's no way the plumber would admit it.