- a person or thing that restrains.
- Photography. a chemical added to a developer to retard its action.
Origin of restrainer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for restrainer
For he was zealous, and yet not wanting in knowledge, the restrainer of zeal.
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
He was best known for his tannin process and alkaline developer, with a bromide solution as a restrainer.The Evolution of Photography
The development is extremely slow, without any tendency to fog; thus the addition of a restrainer should be avoided.
- a person who restrains
- 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