A square base, as for a vase.Origin of plinth French plinthe, from Latin plinthus, from Greek plinthos, tile, plinth. plinth Noun (plural plinths)A block or slab upon which a column, pedestal, statue or other structure is based.The bottom course of stones or bricks supporting a wall.A base or pedestal beneath a cabinet.Origin From Ancient Greek ?????????????????????????????? (plinthos, ???brick??