Found 2 items, similar to sill.
English → English (WordNet) Definition: sill sill n 1: structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure 2: (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock
English → English (gcide) Definition: Sill Sill \Sill\, n. [Cf. Thill.] The shaft or thill of a carriage. [Prov. Eng.] [1913 Webster] Sill \Sill\, n. [Cf. 4th Sile.] A young herring. [Eng.] [1913 Webster] Sill \Sill\ (s[i^]l), n. [OE. sille, sylle, AS. syl, syll; akin to G. schwelle, OHG. swelli, Icel. syll, svill, Sw. syll, Dan. syld, Goth. gasuljan to lay a foundation, to found.] The basis or foundation of a thing; especially, a horizontal piece, as a timber, which forms the lower member of a frame, or supports a structure; as, the sills of a house, of a bridge, of a loom, and the like. Hence: (a) The timber or stone at the foot of a door; the threshold. (b) The timber or stone on which a window frame stands; or, the lowest piece in a window frame. (c) The floor of a gallery or passage in a mine. (d) A piece of timber across the bottom of a canal lock for the gates to shut against. [1913 Webster] Sill course (Arch.), a horizontal course of stone, terra cotta, or the like, built into a wall at the level of one or more window sills, these sills often forming part of it. [1913 Webster]