One of the mysteries of the English language finally explained.
1A plate for detecting or receiving pressure, especially in an anemometer.
2A plate for applying pressure, especially in a clutch or for holding the film in place in a camera.
Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From pressure + plate.
pressure plate/ˈprɛʃə ˌplɛɪt/
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