(mineralogy) a very widely distributed crystalline form of calcium carbonate, CaCO₃, found as limestone, chalk and marble

A hard crust of calcium salts and food particles on the teeth, developing from plaque.

(inorganic chemistry) A black, solid, of formula CaC₂, manufactured from lime and carbon at high temperatures; reacts with water to form acetylene.

present participle of calculate

(not comparable) Having the ability to calculate. / (especially of a person) Serving one's own interests in an unemotional, analytical manner.

The process of calcining: heating a substance to a high temperature, but below its melting point, to bring about thermal decomposition.

(transitive) To make something hard and stony by impregnating with calcium salts. / (intransitive) To become hard and stony by impregnation with calcium salts.

(alchemy, historical) To heat (a substance) to remove its impurities and refine it.

Something calcined; also, material left over after burning or roasting.

(calculus) The form of calculus that deals with the maxima and minima of definite integrals of functions of many variables.