In a manner relating to or characteristic of catarrh; describing how something occurs with catarrhal inflammation or symptoms.
From 'catarrhal' with the adverb suffix '-ly.' Medical adverb used in historical texts and clinical descriptions.
You won't find 'catarrhally' in modern usage—doctors now say 'with catarrhal symptoms' instead—but it's a relic showing how older medical writing was delightfully more dramatic!
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