The Collaborative International Dictionary of English v.0.48:

etched \etched\ adj.
   Cut or impressed into a surface.

   Syn: engraved, graven, incised.
        [WordNet 1.5]

   2. Corroded so that the surface is matte and not fully
      transparent; -- of glass.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Etch \Etch\, v. t. [imp. & p. p. Etched; p. pr. & vb. n.
   Etching.] [D. etsen, G. [aum]tzen to feed, corrode, etch.
   MHG. etzen, causative of ezzen to eat, G. essen ??. See
   Eat.]
   1. To produce, as figures or designs, on mental, glass, or
      the like, by means of lines or strokes eaten in or
      corroded by means of some strong acid.
      [1913 Webster]

   Note: The plate is first covered with varnish, or some other
         ground capable of resisting the acid, and this is then
         scored or scratched with a needle, or similar
         instrument, so as to form the drawing; the plate is
         then covered with acid, which corrodes the metal in the
         lines thus laid bare.
         [1913 Webster]

   2. To subject to etching; to draw upon and bite with acid, as
      a plate of metal.
      [1913 Webster]

            I was etching a plate at the beginning of 1875.
                                                  --Hamerton.
      [1913 Webster]

   3. To sketch; to delineate. [R.]
      [1913 Webster]

            There are many empty terms to be found in some
            learned writes, to which they had recourse to etch
            out their system.                     --Locke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

etched
    adj 1: cut or impressed into a surface; "an incised design";
           "engraved invitations" [syn: engraved, etched,
           graven, incised, inscribed]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "etched":
   confirmed, deep-dyed, deep-engraven, deep-fixed, deep-grounded,
   deep-laid, deep-rooted, deep-seated, deep-set, deep-settled,
   dyed-in-the-wool, embedded, embossed, engrafted, engraved,
   entrenched, established, firmly established, graven, implanted,
   impressed, imprinted, indelibly impressed, infixed, ingrained,
   ingrown, inveterate, inwrought, long-established, old-line,
   on a rock, on bedrock, rooted, set, settled, stabilized, vested,
   well-established, well-founded, well-grounded, well-set,
   well-settled