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Answer for the clue "A drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs ", 14 letters:
bronchodilator

Word definitions for bronchodilator in dictionaries

WordNet Word definitions in WordNet
n. a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs

Wiktionary Word definitions in Wiktionary
n. (context medicine English) Any drug used to dilate and relax the bronchial passages and ease the flow of air to the lungs

Wikipedia Word definitions in Wikipedia
A bronchodilator is a substance that dilates the bronchi and bronchioles , decreasing resistance in the respiratory airway and increasing airflow to the lungs . Bronchodilators may be endogenous (originating naturally within the body), or they may be medications ...

Usage examples of bronchodilator.

Cocaine is a vasoconstrictor and bronchodilator - it reduces blood flow to vessels near the surface of the skin and opens up the breathing passages.

A nurse and the resident physician rushed out with a gurney and scant minutes later, Kitty was in a cubicle being saturated with bronchodilators.

He’d been treated with IV steroids and bronchodilators as well as humidified air and bed rest.