noun \ˈsil\

: the shelf at the bottom of a window frame

: a piece of wood, metal, or stone at the bottom of a door frame

: the part of the frame of a car that is directly under its doors

Full Definition of SILL

:  a horizontal piece (as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure: as
a :  the horizontal member at the base of a window
b :  the threshold of a door
:  a tabular body of igneous rock injected while molten between sedimentary or volcanic beds or along foliation planes of metamorphic rocks
:  a submerged ridge at relatively shallow depth separating the basins of two bodies of water

Origin of SILL

Middle English sille, from Old English syll; akin to Old High German swelli beam, threshold
First Known Use: before 12th century

Other Building Terms

batten, cistern, hearth, lath, transom, wainscot


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