wood sill

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sill, 1
1. A horizontal timber, at the bottom of the frame of a wood structure, which rests on the foundation.
3. The horizontal bottom member of a window frame or other frame.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The mullioned windows are framed by thick stripped-back wood sills and wall panels.
The main living room has large sash windows, deep solid wood sills and fireplace with wood burning stove.
The newly renovated digs, advertised on Craigslist in early January, feature several small cutouts of brick, framed by wood sills and back-lit like works of art.
She also alleges that most didn't fit, plaster was chipped from internal walls and the team of two fitters could offer only dark wood sills to match the new white uPVC frames.