What does ague mean?
Ague is a chiefly historical term for a fever characterized by recurring bouts of violent shivering followed by sweating and heat. In earlier centuries it was the everyday English word for what we now recognize as malaria, especially in marshy regions such as the fens of England or the wetlands of Italy and America, where the disease was rampant. The word derives from the Latin 'acuta' (febris), meaning an acute fever, entering English through medieval French. Today ague has largely fallen out of clinical use, surviving primarily in literature and historical accounts, where it evokes a world before germ theory — a time when fevers were blamed on 'bad air' rising from swamps. Its adjective form is 'aguish'. For readers of older texts, knowing ague is essential: phrases like 'seized with an ague' or 'the marsh ague' appear constantly in classic fiction, travel writing, and medical history, and the word remains a vivid shorthand for malarial fever and its characteristic shaking fits.
nounA fever marked by recurring paroxysms of shivering and sweating; historically, the term was widely used for malaria.
- A fever with alternating fits of shivering and sweating, especially as caused by malaria.
- (Historical/literary) Any acute febrile illness with chills, used broadly before modern medicine distinguished specific diseases.
"The marshes were notorious for the ague that struck down settlers each autumn."
"After weeks in the Pontine Marshes, he was seized by a violent ague that left him shaking for days."
"In Dickens's novels, characters often fall ill with ague after exposure to damp, unhealthy air."
Rarely used in the plural; when it appears, it typically refers to repeated or multiple episodes of the fever.
"The chronicles record that the monks suffered recurrent agues throughout the winter."
Before anyone knew what malaria was, English speakers blamed it on 'bad air' — and called the disease simply 'ague', from the same Latin root as 'acute'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ague
Ague comes from the Old French 'ague' or 'fiebre ague', from the Latin 'acuta (febris)', meaning 'acute fever' — the same Latin root 'acuere' (to sharpen) that gives us 'acute' and 'acuity'. The word entered Middle English in the medieval period and became the standard term for malarial and other intermittent fevers. Cognates include French 'aigu' and Italian 'acuto', all tracing back to the Latin adjective 'acutus', meaning sharp or pointed.
Related word forms
How ague is actually used
Ague is now largely archaic or literary; modern medicine would describe the underlying condition as malaria or another febrile illness. It survives mainly in historical writing and classic literature, where it carries connotations of damp climates, marshland, and pre-modern medicine.
Easily confused with ague
Vague means unclear or imprecise, while ague is a noun denoting a feverish illness — they share similar spelling and rhyme but nothing else.
Argue is a verb meaning to dispute or reason, whereas ague is an illness; the words differ by only one letter in spelling.