This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The horizontal member that bears the upright portion of a frame, especially the horizontal member that forms the base of a window.

n. Geology An approximately horizontal sheet of igneous rock intruded between older rock beds.

n. A horizontal slat which forms the base of a window.

n. A horizontal, structural member of a building near ground level on a foundation (sense #3) or pilings or lying on the ground in earth-fast construction and bearing the upright portion of a frame. Also spelled cill. Also called a ground plate, groundsill, sole, sole-plate, mudsill. An interrupted-sill fits between posts instead of being below and supporting the posts in timber framing.

n. A horizontal layer of igneous rock between older rock beds.

n. A young herring.

n. The timber or stone at the foot of a door; the threshold.

n. The timber or stone on which a window frame stands; or, the lowest piece in a window frame.

n. The floor of a gallery or passage in a mine.

n. A piece of timber across the bottom of a canal lock for the gates to shut against.

n. The shaft or thill of a carriage.

n. A young herring.

n. A stone or piece of timber on which a structure rests; a block forming a basis or foundation: as, the sills of a house, of a bridge, of a loom; more specifically, a horizontal piece of timber of the frame of a building, or of wood or stone at the bottom of a framed case, such as that of a door or window; in absolute use, a door-sill. See door-sill, ground-sill, mudsill, port-sill, window-sill.

n. In fortification, the inner edge of the bottom or sole of an embrasure. See diagram under embrasure.

n. In mining: The floor of a gallery or passage in a mine.

n. A term used by miners in the lead districts of the north of England as nearly equivalent to bed or stratum. Thus, the basaltic sheets intercalated in the mountain-limestone are called whin -sills.

n. A young herring.

n. A variant of sell.

n. The thill or shaft of a carriage.

n. (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock

n. structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure

"Wolf, if you look real quickly over my shoulder, perhaps you see what they call the sill plates that help to hold up these decks, these porches that they call them here in Chicago."

stone    rock   

head sill    sill knee-iron    sill-dressing machine   

lintel   

threshold   

Bastille    Belleville    Bill    Brazil    Brill    Gil    Gill    Hill    Jill    Lil   

lintel    windowsill    window-sill    jamb    ledge    balustrade    parapet    walkway    pane    shelf