diplopia - a disorder of vision in which two images of a single object are seen because of unequal action of the eye muscles — called also double vision
impost - a block, capital, or molding from which an arch springs (see figure, label imp)
ogee - 1. a molding with an S-shaped profile. 2. a pointed arch having on each side a reversed curve near the apex (same link, label 4)
I'd heard of this last, but couldn't remember either meaning.
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