• To produce patterns on a hard material, such as glass or metal, by selectively removing portions of its surface via a suitable means, such as the use of a plasma, an acid, or a laser beam. Also, to subject a material to such a process. Used, for instance, to create etched circuits.
  • That which is utilized to etch (1). Usually refers to a chemical substance, such as an acid, but may also be a plasma, a laser, an ion beam, and so on. Also called etchant.

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