/ Dictionary / Index O onlay: Meaning and Definition of Find definitions for: on•lay Pronunciation: (n.on'lā", ôn'-v.on&sylplā', ôn-), [key] — n., v., -laid, -lay•ing. —n. an overlay, esp. one in relief. an inlay that restores the occlusal surface of a tooth. —v.t. to place or mount (an onlay) on a surface, esp. for decorative purposes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onlap On Liberty* Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language