The Collaborative International Dictionary of English v.0.48:

Intaglio \In*tagl"io\, n.; pl. E. Intaglius, It. Intagli.
   [It., fr. intagliare to engrave, carve; pref. in- in +
   tagliare to cut, carve. See Detail.]
   A cutting or engraving; a figure cut into something, as a
   gem, so as to make a design depressed below the surface of
   the material; hence, anything so carved or impressed, as a
   gem, matrix, etc.; -- opposed to cameo. Also used
   adjectively.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intaglio
    n 1: a printing process that uses an etched or engraved plate;
         the plate is smeared with ink and wiped clean, then the ink
         left in the recesses makes the print [syn: intaglio
         printing, intaglio, gravure]
    2: glyptic art consisting of a sunken or depressed engraving or
       carving on a stone or gem (as opposed to cameo) [syn:
       intaglio, diaglyph]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "intaglio":
   anaglyph, aquatint, bas-relief, boss, burin, cameo, cameo glass,
   cast, cavo-rilievo, cerography, chalcography, crayon engraving,
   cribbling, cut glass, die, drypoint, embossment, engraving tool,
   etching, etching ball, etching ground, etching needle,
   etching point, form, glyph, glyptograph, graver, high relief,
   intaglio rilevato, intaglio rilievo, last, low relief, mask,
   matrix, medal, medallion, metal cut, mezzotint, mint, mold, needle,
   negative, photoengraving, plaquette, plate engraving, point, punch,
   pyrogravure, relief, relief method, relievo, rocker, scorper,
   sculptured glass, seal, shoe last, stamp, steel engraving, style,
   template, wood engraving, woodburning, woodcut, zincography