a kind of coffeepot in which boiling water in a repeated process is forced up a hollow stem, filters down through ground coffee in a sievelike container, and returns to the pot below.
something that percolates.

1835–45; percolate + -or2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
percolator (ˈpɜːkəˌleɪtə)
a kind of coffeepot in which boiling water is forced up through a tube and filters down through the coffee grounds into a container

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Kim's suggestions are a coffee percolator and a fan, perfect to waft you gently
  from sleep to wakefulness with minimal distress.
Well, you have watched a coffee percolator in action.
The percolator drain pan contains a screen that separates the liquid fat from
  the protein solids.
There is also a stove top percolator coffee pot and old fashioned toaster.
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