corbel

A block projecting from a wall to support a load. A number of blocks, each projecting further than the one below, can be used to support a turret or an oriel window, which is then said to be 'corbelled out'.

'Mackintosh Architecture' led by The Hunterian, University of Glasgow, funded by the Arts and Humanities Research Council; with additional support from The Monument Trust, The Pilgrim Trust, and the Paul Mellon Centre for Studies in British Art; and collaborative input from Historic Scotland and the Royal Commission on the Ancient and Historical Monuments of Scotland.