bronchodilator

noun

1. a substance that acts to dilate constricted bronchial tubes to aid breathing, used especially for relief of asthma.

noun

1. any drug or other agent that causes dilation of the bronchial tubes by relaxing bronchial muscle: used, esp in the form of aerosol sprays, for the relief of asthma

n.

1. An agent that causes an increase in the caliber of a bronchus or bronchial tube and eases breathing by relaxing bronchial smooth muscle.

1. A drug that widens the air passages of the lungs and eases breathing by relaxing bronchial smooth muscle.