The Britannia Lexicon

OFF-SET :
the portion of a buttress which is left exposed when the part above is reduced in thickness, usually a slope.

OGEE :
design ofan arch or window incorporating both convex and Concave curves.

ORDEAL :
method of trail in which the accused is given a physical test (usually painful and/or dangerous) which, presumably, can only be met successfully if he is innocent.

ORIEL WINDOW :
projecting curved or polygonal window.

OUBLIETTE :
dungeon or pit under the floor, reached by a trap-door, used for incarcerating prisoners (Scottish pit prison).





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