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1. a shelf at the bottom of a window inside a room
2. a horizontal piece along the outside lower member of a window, that throws water clear of the wall below
3. the lower horizontal member of a window or door frame
4. a continuous horizontal member placed on top of a foundation wall in order to carry a timber framework
5. a flat usually horizontal mass of igneous rock, situated between two layers of older sedimentary rock, that was formed by an intrusion of magma
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The horizontal exterior member at the bottom of a window or door opening which is usually sloped away from the bottom of the window for drainage of water, and overhanging the wall below.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a tabular body of intrusive rock that parallels the surrounding layered rock. Sills sometimes reach lengths up to tens of kilometers; those composed of basic and ultrabasic mag-matic rocks are especially common.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
The lowest horizontal member of a framed partition or of a window or door frame.
A timber laid across the foot of a trench or a heading under the side truss.
The horizontal overflow line of a dam spillway or other weir structure.
A horizontal member on which a lift gate rests when closed.
A low concrete or masonry dam in a small stream to retard bottom erosion.
A type of robot articulation that has three degrees of freedom.
Submarine ridge in relatively shallow water that separates a partly closed basin from another basin or from an adjacent sea.
A tabular igneous intrusion that is oriented parallel to the planar structure of surrounding rock.
A piece of wood laid across a drift to constitute a frame to support uprights of timber sets and to carry the track of the tramway.
The floor of a gallery or passage in a mine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. A horizontal timber, at the bottom of the frame of a wood structure, which rests on the foundation.
2. A doorsill.
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.