reducer

[ri-doo-ser, -dyoo-]
noun
1.
a person or thing that reduces.
2.
Photography.
a.
an oxidizing solution for lessening the density of an exposed negative.
b.
a developing agent.
3.
(in plumbing) a coupling decreasing in diameter at one end. Compare increaser ( def 2 ).

Origin:
1520–30; reduce + -er1

antireducer, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reducer (rɪˈdjuːsə)
 
n
1.  photog Compare intensifier a chemical solution used to lessen the density of a negative or print by oxidizing some of the blackened silver to soluble silver compounds
2.  a pipe fitting connecting two pipes of different diameters
3.  a person or thing that reduces

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Willow bark is an effective fever reducer all by itself.
If she cannot have complete control, she plans on shrinking it with her powerful reducer ray.
Always purge spray equipment before use with listed reducer.
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