Word family noun peace peacefulness pacifier pacifism pacifist adjective peaceful peaceable pacifist verb pacify adverb peacefully peaceably
From Longman Dictionary of Contemporary Englishpacifierpac‧i‧fi‧er /ˈpæsəfaɪə $ -faɪər/ noun [countable] 1 
American EnglishDHB a rubber object that you give a baby to suck so that it does not cry SYN dummy British English2 CALMsomething that makes people calmExamples from the Corpus
pacifier• It had proved quite an exciting substitute for lost love, and a pacifier in that time of grave trouble.• Food can be a pacifier to disturbed feelings.• The best pacifier appears to be applause, the kind of attention 2-year-olds demand from their parents.• Was 1, fed on formula from birth, fruitlessly searching for a suitable pacifier at twenty-three? 