noun, plural calx·es, cal·ces [kal-seez] /ˈkæl siz/.
  1. the oxide or ashy substance that remains after metals, minerals, etc., have been thoroughly roasted or burned.
  2. lime1(def 1).

Origin of calx

1350–1400; late Middle English < Latin: lime; replacing Middle English cals < Old French < Latin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for calx

Historical Examples of calx

British Dictionary definitions for calx


noun plural calxes or calces (ˈkælsiːz)
  1. the powdery metallic oxide formed when an ore or mineral is roasted
  2. another name for calcium oxide
  3. anatomy the heel

Word Origin for calx

C15: from Latin: lime, from Greek khalix pebble
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

calx in Medicine


n. pl. calx•es
  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 Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.