The Collaborative International Dictionary
Bolection \Bo*lec"tion\, n. (Arch.)
A projecting molding round a panel. Same as Bilection.
--Gwilt.
[1913 Webster] ||
Wiktionary
n. (context architecture English) A moulding that covers a joint, especially between joints between surfaces on different levels.
Wikipedia
A bolection, sometimes called balection, bilection or similar, is a moulding which projects beyond the face of a panel or frame, usually found in panelling, doors and fireplaces, especially when the meeting surfaces are at different levels. Bolection was used to great effect by Christopher Wren .
The term was first used in the early 18th century; its etymology is uncertain.
Bolection mouldings are also used to hold a panel in a door when the panel is not set into a continuous dado (groove) that surrounds the panel. The mouldings are usually rabbeted and are attached to the door stiles and rails but are not attached to the panel which is allowed to float freely (expand and contract).
Usage examples of "bolection".
Here there was more change than the outside indicated, and Ward saw with regret that fully half of the fine scroll-and-urn overmantels and shell-carved cupboard linings were gone, whilst most of the fine wainscotting and bolection moulding was marked, hacked, and gouged, or covered up altogether with cheap wall-paper.