sill (redirected from Sills)

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.

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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