Longman Dictionary of Contemporary English homepage

overlay

2 noun
     
o‧ver‧lay2 [countable]
1 something which covers something else:
the brass fire surround with its decorative overlay
2 a transparent sheet with a picture or drawing on it which is put on top of another picture to change it
3 an additional quality or feeling:
sad stories with an overlay of humour
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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