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From Biology-Online Dictionary
1. The act, art, or practice of engraving by means of acid which eats away lines or surfaces left unprotected in metal, glass, or the like. See etch, v. T.
2. A design carried out by means of the above process; a pattern on metal, glass, etc, produced by etching.
3. An impression on paper, parchment, or other material, taken in ink from an etched plate. Etching figures, a stitch used outline embroidery.