The DICT Development Group

  Calx \Calx\, n.; pl. E. Calxes, L. Calces. [L. Calx, calcis.
     limestone; cf. Gr. ? gravel. ?, ?, pebble, Skr. ? gravel, Ir.
     carraic rock Gael. carraig, W. careg, stone. Cf. Chalk.]
     [1913 Webster]
     1. (Chem.)
        (a) Quicklime. [Obs.]
        (b) The substance which remains when a metal or mineral
            has been subjected to calcination or combustion by
            heat, and which is, or may be, reduced to a fine
            powder.
            [1913 Webster]
  
     Note: Metallic calxes are now called oxides.
           [1913 Webster]
  
     2. Broken and refuse glass, returned to the post.

  calx
      n 1: a white crystalline oxide used in the production of calcium
           hydroxide [syn: calcium oxide, quicklime, lime,
           calx, calcined lime, fluxing lime, unslaked lime,
           burnt lime]

  21 Moby Thesaurus words for "calx":
     ash, ashes, brand, carbon, charcoal, cinder, clinker, coal, coke,
     coom, dross, fume, lava, reek, scoria, slag, smoke, smudge, smut,
     soot, sullage