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cill, or sill, sole, sule.
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.