Noun restrainer has 2 senses
  1. 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
    --1 has particulars: potassium bromide
  2. 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