What does febrility mean?
Febrility is a formal noun denoting the state of being feverish — the flushed, heated, weakened condition that accompanies fever. It derives from the Latin febrilis, 'pertaining to fever,' the same root that gives English the adjective febrile. In medical and literary prose alike, febrility conveys more than mere temperature: it suggests the whole ensemble of symptoms — shivering, exhaustion, restlessness — that fever brings. The word also carries a secondary, now uncommon sense referring to general bodily weakness or frailty, extending its reach beyond strict fever into a broader impression of delicate health. Because it is rare and elevated in register, febrility lends writing a deliberately clinical or antique flavor; most modern speakers would say 'feverishness' instead. Still, it remains useful for precise description, and its shared ancestry with fever, febrile, and febrifuge makes it a neat window into how medicine's Latin inheritance shaped English vocabulary.
nounThe state or condition of being feverish; feverishness. In an extended and now less common sense, it can also denote general weakness or feebleness of health.
- The condition of being feverish; feverishness.
- General physical weakness or feebleness, especially as arising from illness.
"The patient's febrility persisted for days despite the antibiotics."
"Her febrility eased once the infection finally began to respond to treatment."
"He wrote his letters with a trembling hand, a febrility that had overtaken him in his final months."
Rarely used in the plural; the word is almost always treated as an uncountable state or condition.
"The physician had seen every variety of febrilities the tropics could produce."
Before thermometers told you you had a fever, doctors had to rely on words like 'febrility' — a term that captures both the burn of a fever and the frailty it leaves behind.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of febrility
Febrility comes from the Latin febrilis, meaning 'of or pertaining to fever,' which itself derives from febris, the Latin word for fever. The term entered English in the early modern period, when much medical vocabulary was borrowed directly from Latin. Its relatives in English include the adjective febrile, the rarer noun febricity, and febrifuge, meaning something that reduces fever — all descendants of the same Latin root.
How febrility is actually used
Febrility is a formal, literary, or medical-register word, rare in everyday conversation where 'feverishness' or simply 'a fever' is preferred. Its secondary sense of generalized frailty is older and less frequently encountered today.
Easily confused with febrility
Febrile is the adjective meaning feverish ('a febrile patient'), while febrility is the noun naming the feverish state itself.
Febricity is a rarer synonym for feverishness; febrility additionally carries a secondary sense of bodily weakness or frailty.
Fertility refers to the capacity to produce offspring or vegetation, and merely resembles febrility in spelling.