Parapet vs. Sill — What's the Difference?

A parapet is a barrier that is an extension of the wall at the edge of a roof, terrace, balcony, walkway or other structure. The word comes ultimately from the Italian parapetto (parare 'to cover/defend' and petto 'chest/breast').

A horizontal member that bears the upright portion of a frame.

A low protective wall or railing along the edge of a raised structure such as a roof or balcony.

A windowsill.

An earthen or stone embankment protecting soldiers from enemy fire.

(Geology) A sheet of igneous rock formed by the intrusion of magma between existing strata.

A low protective wall.

A breast wall; window breast; horizontal brink which forms the base of a window.

Part of a perimeter that extends above the roof.

(construction) A threshold; horizontal structural member of a building near ground level on a foundation or pilings, or lying on the ground, and bearing the upright portion of a frame; a sill plate.

(military) A fortification consisting of a wall.

(geology) A stratum of rock, especially an intrusive layer of igneous rock lying parallel to surrounding strata.

A low wall, especially one serving to protect the edge of a platform, roof, bridge, or the like.

A threshold or brink across the bottom of a canal lock for the gates to shut against.

A wall, rampart, or elevation of earth, for covering soldiers from an enemy's fire; a breastwork. See Illust. of Casemate.

(anatomy) A raised area at the base of the nasal aperture in the skull.

A low wall along the edge of a roof or balcony

The inner edge of the bottom of an embrasure.

Fortification consisting of a low wall

(UK) A young herring.

The shaft or thill of a carriage.

Silly.

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.

The shaft or thill of a carriage.

A young herring.

Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure

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