Lath and plaster:

A traditional finish for an internal wall or ceiling, comprising timber laths fixed across timber studs or joists as a base for plasterwork.

Lintel:

A beam over a door or window opening, supporting the structure above.

Lintel:

A structural beam of stone, concrete or timber located above a door or window opening, supporting the masonry above.

Load bearing wall:

A wall which supports another structure directly above, such as a floor, a beam or a partition wall on an upper storey.