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a substance that acts to dilate constricted bronchial tubes to aid breathing, used especially for relief of asthma. bronchodilator.
Save. Bronchodilation is the process by which the bronchi (tubes in the lungs made of connective tissue and muscle) are dilated, or opened. There are circumstances and conditions that cause the bronchi of the lungs to become narrow, or constrict, making it difficult to breathe.