01 n. A small arch thrown across the corner of a square room to support a superimposed mass, as where an octagonal spire or drum rests upon a squ…
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1.
A small arch thrown across the corner of a square room to support a superimposed mass, as where an octagonal spire or drum rests upon a square tower; -- called also sconce, and sconcheon.(Arch.) Also: sconce, sconcheon