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A true-plate used to test a plane surface.
(noun)
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A plate used as a cover or shield for any object subject to shock or abrasion.
(noun)
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The disk attached to the revolving spindle of a lathe to which the piece to be turned is often fastened.
(noun)
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The cover of a journal-box on a railroad-car.
(noun)
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The outer plate, or web, which joins the rim and the hub of a car-wheel.
(noun)
The Century Dictionary (Public Domain)