Restrainer

//ɹɪˈstreɪnɚ// noun

Definitions

Noun
  1. 1
    Something that restrains.
  2. 2
    a person who directs and restrains wordnet
  3. 3
    A chemical compound (such as potassium bromide), added to a developer to prevent fogging.
  4. 4
    a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film wordnet

Etymology

From restrain + -er.

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