IPA: /ˌæntiˈæsmə/
KK: /æntiˈæsmə/
Describing something that works against or prevents asthma symptoms.
The doctor prescribed an antiasthma medication to help manage her condition.
Antiasthma is formed from "anti-" (meaning against) and "asthma" (from Greek "asthma", meaning breathlessness or difficulty in breathing). The word refers to something that works against asthma or alleviates its symptoms.
Think of 'anti-' meaning against, and 'asthma' referring to difficulty in breathing — so antiasthma means something that helps against breathing difficulties.