[ab-sawr-ber, -zawr-]
a person or thing that absorbs.
Physics. a material in a nuclear reactor that absorbs neutrons without reproducing them.

1785–95; absorb + -er1

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World English Dictionary
absorber (əbˈsɔːbə, -ˈzɔː-)
1.  a person or thing that absorbs
2.  physics a material that absorbs radiation or causes it to lose energy

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The core, in turn, is an efficient absorber of electromagnetic radiation.
In modern humans, metatarsals create the distinctive arch of the foot and act
  as a shock absorber while keeping the foot stiff.
Boric acid is a strong neutron absorber which will help prevent the nuclear
  fuel from overheating.
Monetary policy might be a good shock absorber but it can't do much to alter
  structural changes.
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