Designs or pictures cut into the surface of metal, glass, or other materials using acid or sharp tools; or prints made from these designs.
From Dutch 'etsen' (to eat), because acid 'eats' into the metal surface. The verb 'etch' was borrowed into English in the 1600s during the Dutch Golden Age of art.
Rembrandt was a master of etchings, and he made over 300 of them — he'd deliberately wipe and reprint his plates differently to create variations, making each print unique even though they came from the same design.
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