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GLOSSARY OF WINDOW AND RELATED TERMS

Keyed Oculus
keyed oculus, a circular window with keystones disposed around the architrave, usually four arranged cross–wise, but occasionally more.
See also oeil–de–boeuf.
keyhole–arch, see horseshoe–arch.
Keystone
keystone, a wedge–shaped block of masonry at the apex of an arch, or at the centre of a flat arch.
See also dropped keystone.