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a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs

a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs

1. Causing an increase in caliber of a bronchus or bronchial tube. 2. An agent which possesses this power.

The name applied to the nerve fibers which cause dilatation of the bronchioles by inhibition of the tone of the circular layer of muscle.