in chemistry and pharmacy, the operation by which essences, tinctures, &c. are drawn from natural bodies. See Extract.

in surgery, is the drawing any foreign matter out of the body by the hand, or by the help of instruments. See Surgery.

in genealogy, implies the stock or family from which a person is descended. See DESCENT.

EXTRACTION of Roots, in algebra and arithmetic, the methods of finding the roots of given numbers or quantities. See ALGEBRA, and ARITHMETIC.