1 Horizontal timber (usually called a cill-beam, ground-cill, or sole-piece or -plate) at the bottom of a timber-framed wall into which posts and studs are tenoned. A cill-wall is a low wall of brick or stone supporting the cill-beam. In timber-framed construction, an interrupted cill runs between main posts and is tenoned into them.
2 Lower horizontal projecting element below an aperture (e.g. doorway or window), to throw water off the naked of the wall below.
3 Lower horizontal member of a door-or window-frame.
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