Definition of plinth
1a
: the lowest member of a base : subbase
b
: a block upon which the moldings of an architrave or trim are stopped at the bottom
2
: a usually square block serving as a base
broadly
: any of various bases or lower parts
3
: a course of stones forming a continuous foundation or base course
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Merriam-Webster unabridged
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Time Traveler for plinth
The first known use of plinth was in 1563
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