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See more synonyms for restrainer on Thesaurus.com
  1. a person or thing that restrains.
  2. Photography. a chemical added to a developer to retard its action.
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Origin of restrainer

First recorded in 1560–70; restrain + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for restrainer

Historical Examples

  • For he was zealous, and yet not wanting in knowledge, the restrainer of zeal.

    St. Bernard of Clairvaux's Life of St. Malachy of Armagh

    H. J. Lawlor

  • The bromide is called a restrainer, as it makes the development of the image proceed more slowly.

  • What self-willed one would desire a mighty lord as his ruler and restrainer?

    The Kath Sarit Sgara

    Somadeva Bhatta

  • He was best known for his tannin process and alkaline developer, with a bromide solution as a restrainer.

  • The development is extremely slow, without any tendency to fog; thus the addition of a restrainer should be avoided.

British Dictionary definitions for restrainer


  1. a person who restrains
  2. a chemical, such as potassium bromide, added to a photographic developer in order to reduce the amount of fog on a film and to retard the development
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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