Definify.com
Webster 1913 Edition
Sill
Sill
(sĭl)
, Noun.
[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;
Hence: as, the
. sills
of a house, of a bridge, of a loom, and the like(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.
Webster 1828 Edition
Sill
SILL
,Noun.
1.
Properly, the basis of foundationof a thing; appropriately, a piece of timber on which a building rests; the lowest timber of any stucture; as the sills of a house, of a bridge, of a loom and the like.2.
The timber or stone at the foot of a door; the threshhold.3.
The timber or stone on which a window frame stands; or the lowest piece in a window frame.4.
The shaft or thill of a carriage. [Local.]