restrainer

[ri-strey-ner]
noun
1.
a person or thing that restrains.
2.
Photography. a chemical added to a developer to retard its action.

Origin:
1560–70; restrain + -er1

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World English Dictionary
restrainer (rɪˈstreɪnə)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As a steer is being moved into the restrainer, it balks.
Another example is an earthquake restrainer attached to an existing bridge with
  resin bonded anchors.
If an animal is walking into the restrainer by itself, do not poke it with an
  electric prod.
In large commercial operations, a series of chutes and restrainer conveyers
  move the hogs into position for stunning.
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