名詞 bronchodilator:

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

bron.cho.di.la.tor

n.（名詞）
A drug that widens the air passages of the lungs and eases breathing by relaxing bronchial smooth muscle.
支氣管擴張劑：一種可加寬肺里空氣通道的藥物，并通過放松支氣管的平滑肌來使呼吸輕松