First Known Use: before 12th century
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
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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