- restrainer - a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film
--1 is a kind of chemical
--1 has particulars: potassium bromide- restrainer, controller - a person who directs and restrains
--2 is a kind of person, individual, someone, somebody, mortal, human, soul
--2 has particulars:subduer, surmounter, overcomer; suppressor, suppresser; withholder Derived forms: verb restrain1, verb restrain5, verb restrain4, verb restrain3, verb restrain2 - restrainer, controller - a person who directs and restrains