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Jack Stud - A stud adding to the support of roof rafters.

Jamb - The vertical members of a window or door frame.

Jenkins-head Roof - A gabled roof with its apex truncated by a small hipped roof.

Joist - Wood framing members, usually set 16" apart on center, carefully chosen to support all "live" and "dead" loads.

Keystone - The central, topmost stone of an arch.

Knee Wall - A wall supported by jack studs in half- story construction.

Lally Column - A post supporting a girder or I-beam.

Lath - Mesh metal, plasterboard, or thin wooden strips used as a foundation for plaster or stucco.

Lattice - A grille created by cris-crossing or decoratively interlacing strips of material.

Leaded Window - A window decorated by artistic inserts of lead.

Leader - Down spout

Ledger Strip - A wooden strip nailed along the bottom face of one support to aid in the support of another member brought.

Light - A window glass.

Lintel - A horizontal supporting crosspiece over an opening.

Live Load - The weight of people, things and materials that are not always present at the same place in a building.

Louver Vent - An opening fitted with a series of sloping slats arranged to admit light and air but shed rain

Mansard - A roof type with two slopes on each of the four sides, the lower slope being steeper than the other; capped off with a cupola, typically Victorian.

Masonry - Stonework or brickwork

Meeting Rails - The name applied to rails of window sash that meet one another when the window is closed.

Millwork - Finished woodwork, cabinetry, carving, etc.

Modillion - A bracket supporting the upper part of a composite or Corinthian cornice.

Modular Planning - Planning a home in multiples of four feet in order to reduce material waste and cut labor cost.

Molding - Shaped decorative outlines on projecting cornices and members in wood and stone.

Mullion - The vertical member separating adjacent windows.

Muntin - Wood or metal strips separating lites.

Newel - The terminating baluster at the lower end os a handrail.

Niche - A recess in a wall to place various decorations.

Nosing - The rounded fore-edge of a stair tread.

Obelisk - An Egyptian monument with a tall, tapering shaft of stone with a pyramidal top.

Outlet - A passage connecting the gutter to the Down spout.

Outside Stop - A strip of wood or metal fastened to the inside perimeter of a window frame that holds the sash against the parting strip.

Oriel - A box-like window projecting from the wall of a house.