"overlay" in the noun sense
1. sheathing, overlay, overlayer
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
2. overlay
a layer of decorative material (such as gold leaf or wood veneer) applied over a surface
"overlay" in the verb sense
1. overlie
lie upon lie on top of
"cover the meat with a lot of gravy"
"the granite overlies the older rocks"
2. overlie, overlay
kill by lying on
"The sow overlay her piglets"
"The sow overlay her piglets"
Source: WordNet® (An amazing lexical database of English)
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