To reduce a substance to a powder or to a friable state, by the action of heat; or to expel from a substance some volatile matter, combined with it, or forming its cementing principle, as the carbonic acid from limestone, or the water of crystalization from salts.

To oxydize, as a metal; to reduce to a metallic calx.

To dissolve; to destroy the principles which unite.

To be converted into a powder or friable substance, or into a calx, by the action of heat.