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[ri-doo-ser, -dyoo-] /rɪˈdu sər, -ˈdyu-/
a person or thing that reduces.
  1. an oxidizing solution for lessening the density of an exposed negative.
  2. a developing agent.
(in plumbing) a coupling decreasing in diameter at one end.
Compare increaser (def 2).
Origin of reducer
1520-30; reduce + -er1
Related forms
antireducer, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for reducer
Historical Examples
  • The alkali sets the reducer in action and is called the accelerator.

  • Or, is it king Nala the reducer of hostile towns that hath come here?

  • Helen's next remark was in the natures of a reducer for the said expansion.

    The Portygee Joseph Crosby Lincoln
  • To prepare this reducer, take one part varnish (the same varnish to be reduced), and two parts of turpentine.

  • He is not to be dreaded by widows and orphans; he is a reducer of surplusage.

  • Very many, if not most, slides are all the better for just a touch of a "reducer" such as follows:—The ordinary "hypo."

  • The destroyer of enemies,” “the reducer of the disobedient,” “the exterminator of rebels,” “he whose sword is good.

    Tradition John Francis Arundell
British Dictionary definitions for reducer


(photog) a chemical solution used to lessen the density of a negative or print by oxidizing some of the blackened silver to soluble silver compounds Compare intensifier (sense 3)
a pipe fitting connecting two pipes of different diameters
a person or thing that reduces
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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