i'soton'ic so'dium chlo'ride solu"tion
an aqueous solution of 0.9 percent sodium chloride, isotonic with the blood and tissue fluid, used in medicine chiefly for bathing tissue and, in sterile form, as a solvent for drugs that are to be administered parenterally to replace body fluids. Also called normal saline solution, physiological salt solution, physiological sodium chloride solution. Cf. Ringer's solution.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.