Characterized by or resembling the symptoms of ague; feverish or subject to chills and fever.
Formed from 'ague' plus the adjectival suffix '-y' in Middle English. This pattern of naming adjectives after diseases was common in medieval English.
Doctors in the 1700s would write 'the patient appears aguey' in their notes, using the adjective almost like a diagnosis—which is actually not bad, since fever patterns were one of the few reliable symptoms they could observe.
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