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.

A windowsill (also written window sill or window-sill, and less frequently in British English, cill) is the horizontal structure or surface at the bottom of a window. Window sills serve to structurally …

SILL definition: 1. a flat piece of wood, stone, etc. that forms the base of a window or door 2. a flat piece of…. Learn more.

noun a horizontal timber, block, or the like serving as a foundation of a wall, house, etc. the horizontal piece or member beneath a window, door, or other opening. Geology. a tabular …

Define sill. sill synonyms, sill pronunciation, sill translation, English dictionary definition of sill. n. 1. a. A horizontal member that bears the upright portion of a frame. b. A windowsill. 2. Geology A …

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Almost certainly sill because it's better-known, while cill is rare enough that some may not recognise it, or think it incorrect even though it isn't. The full Oxford English Dictionary includes …

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

Sill-Rite manufactures and sells interior vinyl window sills to residential and building material dealers, including Home Depot in Ontario, California. Learn more.

In geology, a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or along the direction of foliation in metamorphic rock. A sill …