Definition from Wiktionary, the free dictionary
See also Asthma
From Ancient Greek ἆσθμα (asthma, “laborous breathing”).
- (pathology) A long-term respiratory condition, in which the airways may unexpectedly and suddenly narrow, often in response to an allergen, cold air, exercise, or emotional stress. Symptoms include wheezing, shortness of breath, chest tightness, and coughing.
Derived terms 
chronic respiratory disease