Calx :: Calx (n.) 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..
Calx :: Calx (n.) Broken and refuse glass, returned to the post..
Falx :: Falx (n.) A curved fold or process of the dura mater or the peritoneum; esp., one of the partitionlike folds of the dura mater which extend into the great fissures of the brain..