Dictionary

sill

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

1
:  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
2
:  a tabular body of igneous rock injected while molten between sedimentary or volcanic beds or along foliation planes of metamorphic rocks
3
:  a submerged ridge at relatively shallow depth separating the basins of two bodies of water
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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
SILL Defined for Kids

sill

noun \ˈsil\

Definition of SILL for Kids

1
:  a heavy horizontal piece (as of wood) that forms the bottom part of a window frame or a doorway
2
:  a horizontal supporting piece at the base of a structure

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