calenture

noun

1. A heat stroke or fever, often suffered in the tropics.

   “To returne: in changing so many parallels, the weather increast from warme to raging hot, the Sunne flaming all day, insomuch that Calentures begun to vexe us.”

   “Yet even in this voyage I had my misfortunes too; particularly that I was continually sick, being thrown into a violent calenture by the excessive heat of the climate.”

2. A delirium occurring from such symptoms, in which a stricken sailor pictures the sea as grassy meadows and wishes to dive overboard into them.