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sill

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

Sill

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 It might be outdated or ideologically biased.

Sill

 

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.

sill

[sil]
(building construction)
The lowest horizontal member of a framed partition or of a window or door frame.
(civil engineering)
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.
(control systems)
A type of robot articulation that has three degrees of freedom.
(geology)
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.
(mining engineering)
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.

sill

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.
References in periodicals archive ?
(1980) A Petrologic and Geochemical Study of the Francon Silicocarbonatite Sills, Montreal, Quebec.
Shortly after the teacher was fired, the school informed the Sills family, including the sophomore student, that they were no longer welcome at Loretto on the grounds that their actions included "taunts, threats, and verbal abuse directed against members of the school community, as well as a mass e-mail camapign slandering the school's reputation as a Catholic institution."
As Sills' dissent observes, only three of the city's 23 cybercafes have experienced the "gang-related violence" that provided the rationale for the law.
The ProFormance[TM] Rot-Proof Sill was the first step and was introduced at this year's International Builders' Show in Las Vegas.
Peachtree, for example, uses an injection-molded polymer in place of wood in its weeped sills for in-swing doors but still uses wood in its raised sills.
Though she lives and teaches in Boston, photographer Vaughn Sills spent a few years in high school in the South.
Sills of Georgia Reproductive Specialists, Atlanta.
We plan by the end of year in hopes of making substantial savings of time lost (for players) with those injuries," Sills said.
I had my concrete window surrounds, sills and front wall painted using Sandtex ultra smooth masonry paint with a 15-year guarantee.
Sills III has been named as president and chief executive officer the bank effective September 1, 2014.
Sills Cummis & Gross was represented on the eight-year sublease by global commercial real estate services firm Savills Studley.