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

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.

EXTRACTION of roots, in algebra and arithmetic. See Algebra, p. 86. and Arithmetic, p. 420.