overlay

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o·ver·lay

(ō'vĕr-lā),
An addition to an already existing condition.

overlay

[ō′vərlā]
to add to an existing condition or structure; to lay on top of something.

o·ver·lay

(ō'vĕr-lā)
An addition to an already existing condition.

overlay

a later component superimposed on a pre-existing state or condition.