calx

CALX, noun Properly lime or chalk; but more appropriately, the substance of a metal or mineral which remains after being subjected to violent heat, burning, or calcination, solution by acids, or detonation by niter, and which is or may be reduced to a fine powder. Metallic calxes are now called oxyds. They are heavier than the metal from which they are produced, being combined with oxygen. CALX nativa, native calx a kind of marly earth, of a dead whitish color, which, in water, bubbles or hisses, and without burning, will make a cement, like lime or gypsum. CALX viva, quick-lime, is lime not slaked.