< /ˈkæl siz/.

  1. the oxide or ashy substance that remains after metals, minerals, etc., have been thoroughly roasted or burned.
  2. lime1(def 1).


  1. a plural of 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

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.
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