bronchodilators

Drugs that cause expansion of vital airways in the lungs, allowing for improved respiration.
Found on http://www.thehorse.com/Glossary.xhtml?L=B

Bronchodilators

herbs that expand the clear space within the bronchial tubes, opening up airways and relieving obstruction.
Found on http://www.encyclo.co.uk/local/20575
No exact match found