attenuator

[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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World English Dictionary
attenuator (əˈtɛnjʊˌeɪtə)
 
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

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Example sentences
Each attenuator shall be complete and contain all external and internal parts
  necessary to give satisfactory service.
In the figure a sheet at the top of the attenuator is represented.
The thrust attenuator paddles are attached to the aft fuselage.
The nose of the impact attenuator must also be highly visible to approaching
  traffic for all lighting and weather conditions.
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