semi-octagonal

English

Etymology

From semi- +‎ octagonal.

Adjective

semi-octagonal (not comparable)

1. In the shape of a half-octagon.
   • 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 Beauties of England and Wales, Or, Delineations, Topographical, Historical, and Descriptive, of Each County, volume 11, page 159:

     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.

   • 1934, An Inventory of the Historical Monuments in Herefordshire, volume III North-West, London: His Majesty’s Stationery Office, page 121:

     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 semi-octagonal shafts.

   • 2023, Yu Bai, editor, Composites for Building Assembly: Connections, Members and Structures, Springer nature, page 366:

     The Octatube nodal joint consists of an octagonal base plate to which were welded two semi-octagonal plates placed at right angles to each other.