Architrave – The moulding on the outer most edge of the window frame, typically internally within the room.

Top rail – Horizontal bar across the top of the sash that opens.

Staff bead – The moulded bead that is attached to the inside lining which holds the two sashes in place.

Glazing – The glass panels used within a sash.

Meeting rail – Horizontal bar that sits across the top of the lower sash and the bottom of the upper sash.

Inside lining – Inside faces of both the sides and head of the window box frame.

Sash bars – Sometimes referred to as glazing bars, they separate the panes of glass within any sash with than one pane.

Sash stiles – Run vertically up both sides of a sash.

Window board or nosing – Usually referred to as nosing in the context of a sash window, as there often isn’t the depth for a full windowboard.

Cill or sill – External horizontal bar that spans the bottom of the whole box-frame.

Horn – A decorative feature often found in traditional sash windows.

Bottom rail – The larger horizontal bar situated across the bottom of the lower sash.

Outside lining – The external face of the window frame.