Overlay :: Overlay (v. t.) To lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon..
Overlay :: Overlay (v. t.) To smother with a close covering, or by lying upon..
Overlay :: Overlay (n.) A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
Overlayer :: Overlayer (n.) One who overlays; that with which anything is overlaid.