GNU Collaborative International Dictionary of English

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Found one definition

1.       
   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.]
   
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   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.
   
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   ☞ Metallic calxes are now called oxides.
   
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   2. Broken and refuse glass, returned to the post.