overlay (
http://definr.com/overlay)
n : protective covering consisting, for example, of a layer of
boards applied to the studs and joists of a building to
strengthen it and serve as a foundation for a
weatherproof exterior [syn:
sheathing,
overlayer]
v 1: put something on top of something else; "cover the meat with
a lot of gravy" [syn:
cover]
2: kill by lying on; "The sow overlay her piglets" [syn:
overlie]