noun, plural calxes, calces [kal-seez] .
the oxide or ashy substance that remains after metals, minerals, etc., have been thoroughly roasted or burned.
lime1 ( def 1 ).

1350–1400; late Middle English < Latin: lime; replacing Middle English cals < Old French < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calx (kælks)
n , pl calxes, calces
1.  the powdery metallic oxide formed when an ore or mineral is roasted
2.  another name for calcium oxide
3.  anatomy the heel
[C15: from Latin: lime, from Greek khalix pebble]

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American Heritage
Medical Dictionary

calx (kālks)
n. pl. calx·es or cal·ces (kāl'sēz')

  1. The crumbly residue left after a mineral or metal has been calcined or roasted.

  2. The posterior rounded extremity of the foot; the heel.

The American Heritage® Stedman's Medical Dictionary
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