Overlayer

noun

Definitions

Noun
  1. 1
    A layer of adatoms adsorbed onto a surface, as onto the surface of a single crystal.
  2. 2
    protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior wordnet

Etymology

From over- + layer.

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