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alleviator

[uh-lee-vee-ey-ter] /əˈli viˌeɪ tər/
noun
1.
a person or thing that alleviates.
2.
(in a pipeline) an airtight box, having a free liquid surface, for cushioning the shock of water hammer.
Origin
1805-1815
1805-15; alleviate + -or2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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