Pronunciation: (plinth),[key] —n.Archit. 1. a slablike member beneath the base of a column or pier. See diag. under column. 2. a square base or a lower block, as of a pedestal.
3. Also called plinth' course". a projecting course of stones at the base of a wall; earth table.
4. (in joinery) a flat member at the bottom of an architrave, dado, baseboard, or the like.