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The Collaborative International Dictionary of English v.0.48 (gcide)

Overlay \O"ver*lay`\, n.
1. A covering. --Sir W. Scott.
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2. (Printing) A piece of paper pasted upon the tympan sheet
to improve the impression by making it stronger at a
particular place.
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3. (Computers) A subroutine which occupies a portion of main
memory which is occupied at some other time by another
subroutine during execution of the same program. Overlays
were used as an older technique to allow larger programs
to be executed in restricted main memory space; the same
effect is now accomplished by different techniques.
[PJC]


Overlay \O`ver*lay"\, v. t. [imp. & p. p. {Overlaid}; p. pr. &
vb. n. {Overlaying}.]
1. To lay, or spread, something over or across; hence, to
cover; to overwhelm; to press excessively upon.
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When any country is overlaid by the multitude which
live upon it. --Sir W.
Raleigh.
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As when a cloud his beams doth overlay. --Spenser.
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Framed of cedar overlaid with gold. --Milton.
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And overlay
With this portentous bridge the dark abyss.
--Milton.
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2. Specifically: To cover (an object made of an inexpensive
metal, glass, or other material) with a thin sheet of an
expensive metal, especially with silver or gold.
Distinguished from to {plate}, which is done by a chemical
or electrical deposition process.
[PJC]

3. To smother with a close covering, or by lying upon.
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This woman's child died in the night; because she
overlaid it. --1 Kings iii.
19.
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A heap of ashes that o'erlays your fire. --Dryden.
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4. (Printing) To put an overlay on.
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Overlie \O`ver*lie"\, v. t. [imp. {Overlay}; p. p. {Overlain};
p. pr. & vb. n. {Overlying}.]
To lie over or upon; specifically, to suffocate by lying
upon; as, to overlie an infant. --Quain.
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A woman by negligence overlieth her child in her
sleeping. --Chaucer.
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