The meaning of SILL is a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure.

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Look up sill or sills in Wiktionary, the free dictionary.

sill noun (ROCK LAYER) [ U ] earth science us / sɪl / a layer of rock that is created when hot melted rock forces itself into spaces between other rock, then cools and becomes solid …

A sill is a shelf along the bottom edge of a window, either inside or outside a building.

Oct 31, 2025 · sill (plural sills) (architecture, also "window sill") A breast wall; window breast; horizontal brink which forms the base of a window.

Definition of sill noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

SILL definition: a horizontal timber, block, or the like serving as a foundation of a wall, house, etc. See examples of sill used in a sentence.

/sɪl/ /sɪl/ IPA guide Definitions of sill noun structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure see more

sill noun (ROCK LAYER) [ U ] earth science us / sɪl / a layer of rock that is created when hot melted rock forces itself into spaces between other rock, then cools and becomes solid …