noun Architecture.
a slablike member beneath the base of a column or pier. See diag. under column.
a square base or a lower block, as of a pedestal.
Also called plinth course. a projecting course of stones at the base of a wall; earth table.
(in joinery) a flat member at the bottom of an architrave, dado, baseboard, or the like.

1555–65; earlier plinthus < Latin < Greek plínthos plinth, squared stone, brick, tile

plinthless, adjective
plinthlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plinth (plɪnθ)
1.  Also called: socle the rectangular slab or block that forms the lowest part of the base of a column, statue, pedestal, or pier
2.  Also called: plinth course the lowest part of the wall of a building that appears above ground level, esp one that is formed of a course of stone or brick
3.  a flat block on either side of a doorframe, where the architrave meets the skirting
4.  a flat base on which a structure or piece of equipment is placed
[C17: from Latin plinthus, from Greek plinthos brick, shaped stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1611, from Fr. plinthe, from L. plinthus, from Gk. plinthos "brick, squared stone," cognate with O.E. flint (see flint).
Online Etymology Dictionary, © 2010 Douglas Harper
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