semi-octagonal

Adjective

semi-octagonal (not comparable)

1. In the shape of a half-octagon.
   • The spandrils are also highly decorated with tracery mouldings, inclosing shields, &c. and the whole is inclosed in a sort of square frame, with semi-octagonal buttresses.1810, John Britton, Edward Wedlake Brayley, Joseph Nightingale, James Norris Brewer, John Evans, John Hodgson, Francis Charles Laird, Frederic Shoberl, John Bigland, Thomas Rees, Thomas Maiden, The...
   • The Nave (Plate 12) (81 ft. by 18¾ ft.) is of early 14th-century date and has N. and S. arcades of five bays with two-centred arches of two chamfered orders; the piers are octagonal with hollows sunk on the diagonal faces, moulded capitals and chamfered bases; the responds have attached...1934, An Inventory of the Historical Monuments in Herefordshire, volume III North-West, London: His Majesty’s Stationery Office, page 121