glandular fever
noun/ˌɡlændʒələ ˈfiːvə(r)/
/ˌɡlændʒələr ˈfiːvər/
(British English) (North American English mononucleosis, informal mono)
[uncountable]- a disease that causes the lymph glands to swell (= become large, round and painful) and makes the person feel very weak for a long time
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glandular fever