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chamber A chamber is a room, especially a bedroom. [2 definitions]
diesel engine a type of engine that burns fuel oil. Diesel engines are different from most car engines, which use an electric spark to ignite the fuel. In a diesel engine, the fuel is sprayed into a chamber and set on fire by the heat of air that has been put under high pressure. Big trucks have diesel engines.
vault1 a room, chamber, or passage with a roof or ceiling shaped like an arch. [1/3 definitions]