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scoinson

scoinson Arch.
  (ˈskɔɪnsən)
  [Refashioned form of scuncheon, after its source, OF. escoin{cced}on.]
  Used attrib. in scoinson arch = rear-arch; also in scoinson shaft.

1842 Willis Arch. Nomencl. Mid. Ages 57 The ‘pilastres des écoinsons’ of Roubo, correspond exactly in position to the mediæval 'scoinson shaft (or rear-shaft) above described. 1849 E. Sharpe Decor. Window Tracery v. 28 In Windows which are placed in walls of considerable thickness, or where the Tracery lies near the outer surface,..there frequently occurs an arch which is not to be confounded with the Window-Arch... The object of this Arch, to which Professor Willis was the first to call attention, and which he has named the Scoinson-Arch, appears to have been twofold. 1851 Turner Dom. Archit. II. 166 The scoinson arch is trefoiled. 1887 Archit. Publ. Soc. Dict., Scoinson arch... Also rere and rear arch. The interior edge of a window side.

Oxford English Dictionary

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