1(A) The plinth or socle of a podium. (b) A platband or fillet, especially one above or below the scotia in an Ionic base.
2A square border or frame round a bas-relief, panel, etc.; (more generally) a border or frame of any form.
Mid 17th century; earliest use found in John Evelyn (1620–1706), diarist and writer. From classical Latin quadra a square, (in architecture) raised flat band, fillet (Vitruvius), related to quattuor four; compare classical Latin quadrum a square.