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The Collaborative International Dictionary of English v.0.48 (gcide)

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.