sills
sills
One entry found.
sill
Main Entry: sill
Pronunciation: \ˈsil\
Function: noun
Etymology: Middle English sille, from Old English syll; akin to Old High German swelli beam, threshold
Date: before 12th century
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