A cap made to withstand pressure or to be sensitive to pressure; specifically one that incorporates a pressure relief valve, as on the radiator or coolant tank of a motor vehicle.
Origin
Early 20th century; earliest use found in The Atlanta Constitution.
Definition of pressure cap in US English:
pressure cap
noun
A cap made to withstand pressure or to be sensitive to pressure; specifically one that incorporates a pressure relief valve, as on the radiator or coolant tank of a motor vehicle.
Origin
Early 20th century; earliest use found in The Atlanta Constitution.