Activated Carbon Definition

A form of highly porous carbon that can easily adsorb gases, vapors, and colloidal particles: it is made by destructive distillation of wood, peat, etc., followed by heating the resultant product to high temperatures with steam or carbon dioxide.
Webster's New World

(chemistry) A very absorbent form of finely powdered carbon; used in purifying gases, and as an antidote for many poisons.