Meaning of “asthma” - Learner’s Dictionary

asthma

noun [ U ] uk us /ˈæsmə/

an illness that makes it difficult to breathe:

She had an asthma attack.
asthmatic uk us /æsˈmætɪk/ adjective

an asthmatic child

(Definition of “asthma” from the Cambridge Learner’s Dictionary © Cambridge University Press)