Noun: restrainer ri'strey-nu(r)
- A chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film
"The photographer carefully added the restrainer to achieve the desired contrast"
- A person who directs and restrains
"The coach acted as a restrainer for the overly aggressive player";
- controller
Derived forms: restrainers
Type of: actor, chemical, chemical substance, doer, worker