Definitions for: Sill

[n] structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
[n] (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock

Webster (1913) Definition: Sill, n. [OE. sille, sylle, AS. syl, syll; akin to G.
schwelle, OHG. swelli, Icel. syll, svill, Sw. syll, Dan.
syld, Goth. gasuljan to lay a foundation, to found.]
The basis or foundation of a thing; especially, a horizontal
piece, as a timber, which forms the lower member of a frame,
or supports a structure; as, the sills of a house, of a
bridge, of a loom, and the like. Hence:
(a) The timber or stone at the foot of a door; the threshold.
(b) The timber or stone on which a window frame stands; or,
the lowest piece in a window frame.
(c) The floor of a gallery or passage in a mine.
(d) A piece of timber across the bottom of a canal lock for
the gates to shut against.

Sill course (Arch.), a horizontal course of stone, terra
cotta, or the like, built into a wall at the level of one
or more window sills, these sills often forming part of
it.

Sill, n. [Cf. Thill.]
The shaft or thill of a carriage. [Prov. Eng.]

Sill, n. [Cf. 4th Sile.]
A young herring. [Eng.]

See Also: doorsill, doorstep, rock, stone, structural member, threshold, windowsill

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