the almost triangular space between one side of the outer curve of an arch, a wall, and the ceiling or framework.
  • the space between the shoulders of adjoining arches and the ceiling or molding above.



  1. affected with spavin
  2. old and decrepit

spavin (noun)

  1. swelling, esp. a bony enlargement of the hock of a horse associated with strain

[Attrib. — Eley Williams]