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Newel
The upright post of a staircase which supports the handrail – often turned and decorated.

Nogging
Either infill of masonry laid as panels between a timber wall-frame or small horizontal pieces of timber fixed between the wall studs.

Nosing
A moulding fixture with a rounded edge.

Notch
A groove formed in the side of timber to fix into the matching side of another.

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Obscured Glass
Glass through which light can pass but objects are blurred.

Offset
A distance measured from a survey mark.

Ogee
S-shaped or double curve comprising a convex and a concave section, often seen in decorative archways.

Oil Trap
A sump to capture and prevent oils and greases entering drainage systems.

Open Drain
An open channel by which surface water is carried away.

Oriel
A bay window suspended above ground.