What does calenture mean?
Calenture is an archaic term for a feverish delirium once thought to strike sailors serving in the tropics, attributed to the intense heat of the sun at sea. The condition was notorious in the age of sail: sufferers were said to become so disoriented that they imagined the ocean around the ship to be cool green fields, and some were reported to have leapt overboard in their delusion. The word belongs chiefly to historical and literary contexts — ships' logs, naval memoirs, and accounts of voyages through the doldrums — and carries a strong nautical flavor that makes it useful to writers evoking the hardships of early maritime life. Though medicine no longer uses the term, preferring precise diagnoses such as heatstroke or heat exhaustion, calenture survives as a vivid reminder of how little was understood of tropical illness aboard wooden ships. Its etymology, tracing back through Spanish to Latin roots meaning heat, underscores its origin as a word born of sweltering decks and merciless equatorial sun.
nounA fever or delirium formerly believed to affect sailors in the tropics, supposedly caused by intense exposure to the sun; historically it was said to make sufferers imagine the sea to be green fields and tempt them to leap into it.
- A tropical fever with delirium affecting sailors, traditionally attributed to exposure to the hot sun at sea.
"The ship's log recorded that two men had died of calenture during the long becalmed passage across the doldrums."
"The old surgeon warned the crew that men who slept on deck in the midday sun risked falling into a calenture."
"In his journal, the captain described the delirious sailor's conviction that the sea before him was a field of grass."
The plural is rare, appearing mainly in historical accounts describing outbreaks affecting multiple crew members.
"The ship's muster roll noted several calentures among the hands during the passage through the tropics."
Sailors stricken with calenture were said to see the ocean as inviting green meadows — and some leapt overboard to walk on them.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of calenture
Calenture entered English in the early seventeenth century from Spanish calentura, meaning 'heat' or 'fever', derived from calentar ('to heat'), which traces back to Latin calere ('to be hot'), from the root cal- seen in calor ('heat'). It shares this root with English words such as calorie and caloric. The word spread through European maritime languages as sailors' accounts of tropical voyages circulated, becoming established in English chiefly through naval and travel writing.
Related word forms
How calenture is actually used
Archaic and historical; found mainly in older maritime literature, naval histories, and accounts of tropical voyages rather than in modern clinical usage. Carries a distinctly nautical, period flavor.