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a substance that acts to dilate constricted bronchial tubes to aid breathing, used especially for relief of asthma. bronchodilator.
Definition of valve for Students. 1  1 : a structure in the body that temporarily closes to prevent passage of material or allow movement of a fluid in one direction only a heart valve. 2  2 : a mechanical device by which the flow of liquid, gas, or loose material may be controlled by a movable part.