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Sill

   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia 0.01 sec.

sill

 or sheet

In geology, a tabular igneous intrusion emplaced parallel to the bedding of the enclosing rock. Although they may have inclined orientations, nearly horizontal sills are most common. Sills may range from a few inches to hundreds of feet thick and up to hundreds of miles long. They include rock compositions of all types.


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

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.

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.

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.



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The window frame which prevented anyone from sitting on the outer sill was being forced out by two footmen, who were evidently flurried and intimidated by the directions and shouts of the gentlemen around.
Grasping the sill I pulled myself up to a sitting posture without looking into the building, and gazed down at the baffled animal beneath me.
The students stood up on their stools and craned their heads forward to get a better view of me, and two little girls jumped upon the sill of an open window where they could see more plainly.
 
 
 
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