[ 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

First recorded in 1520–30; reduce + -er1

Related forms

an·ti·re·duc·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for reducer

British Dictionary definitions for reducer


/ (rɪˈdjuːsə) /


photog a chemical solution used to lessen the density of a negative or print by oxidizing some of the blackened silver to soluble silver compoundsCompare intensifier (def. 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