floor plate

noun

Definition of floor plate 

1 : a plate (as of steel or iron) set in or forming part of a floor and sometimes provided with T slots to which heavy work and portable machine tools can be bolted to facilitate machining and erection

2 : a wooden board lying flat on the floor and supporting the studs of a wall

3 : a plate closing the bottom of the magazine recess in a bolt-action rifle having a clip-loaded magazine

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