What is "bed-mould"

n. (context architecture English) The congeries of mouldings which is under the projecting part of almost every cornice, of which, indeed, it is a part.

Bed-mould, in architecture, is a kind of moulding found under the cornice, of which it is a part. Similar to crown moulding, a bed mould is used to cover the joint between the ceiling and wall. Bed moulds can be either sprung or plain, or flush to the wall as an extension of a cornice mould.