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impost

impost
impost
impost

Horizontal projection immediately below the springing of an arch, sometimes immediately above the capital, sometimes used instead of a capital. Not to be confused with an abacus. The commonest 12thc. forms are chamfered, and hollow-chamfered. Either the upright face or the chamfer may be decorated, and there may be a quirk or an angle roll between face and chamfer.