sill

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noun \ˈsil\

Definition of sill

  1. 1 :  a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure: such asa :  the horizontal member at the base of a windowb :  the threshold of a door

  2. 2 :  a tabular body of igneous rock injected while molten between sedimentary or volcanic beds or along foliation planes of metamorphic rocks

  3. 3 :  a submerged ridge at relatively shallow depth separating the basins of two bodies of water

Origin and Etymology 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


SILL Defined for English Language Learners

sill

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noun \ˈsil\

Definition of sill for English Language Learners

  • : the shelf at the bottom of a window frame

  • : a piece of wood, metal, or stone at the bottom of a doorframe

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


SILL Defined for Kids

sill

play
noun \ˈsil\

Definition of sill for Students

  1. 1 :  a heavy horizontal piece (as of wood) that forms the bottom part of a window frame or a doorway

  2. 2 :  a horizontal supporting piece at the base of a structure



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