boilerPronunciation: /ˈbɔɪlə/Translate boiler | into French | into German | into Italian | into Spanish Definition of boiler noun 1a fuel-burning apparatus or container for heating water, in particular: a household device providing a hot-water supply or serving a central heating system. a tank for generating steam under pressure in a steam engine. dated a metal tub for washing or sterilizing clothes at a very high temperature. 2British informal a chicken suitable for cooking only by boiling. 3British informal an unattractive or unpleasant woman. boiler in other Oxford dictionaries Definition of boiler in the US English dictionary