floor plate
noun
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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Merriam-Webster unabridged
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