Webster 1913 Edition
plinthus, Gr. [GREEK] a brick or tile, a plinth, perh. akin to E.
flint: cf. F.
In classical architecture, a vertically faced member immediately below the circular base of a column; also, the lowest member of a pedestal; hence, in general, the lowest member of a base; a sub-base; a block upon which the moldings of an architrave or trim are stopped at the bottom. See Illust. of
Webster 1828 Edition
In architecture, a flat square member in form of a brick, which serves as the foundation of a column; being the flat square table under the molding of the base and pedestal, at the bottom of the order. Vitruvius gives the name to the abacus or upper part of the Tuscan order, from its resemblance to the plinth.
Plinth of a statue, is a base, flat, round or square.
Plinth of a wall, two or three rows of bricks advanced from the wall in form of a platband; and in general, any flat high molding that serves in a front wall to mark the floors, to sustain the eaves of a wall or the larmier of a chimney.