at·ten·u·a·tor

[uh-ten-yoo-ey-ter]
noun Electronics.
a device for decreasing the amplitude of an electronic signal.

Origin:
1920–25; attenuate + -or2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
attenuator (əˈtɛnjʊˌeɪtə) [Click for IPA pronunciation guide]
 
n
1.  physics any device designed to reduce the power of a wave or electrical signal without distorting it
2.  a person or thing that attenuates

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Attenuator is always a great word to know.
So is doohickey. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a gadget; dingus; thingumbob.
Example sentences
The attenuator shall also provide maximum energy transmission for high energy
  applications.
In the figure a sheet at the top of the attenuator is represented.
The nose of the impact attenuator must also be highly visible to approaching
  traffic for all lighting and weather conditions.
Each attenuator shall be complete and contain all external and internal parts
  necessary to give satisfactory service.
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