sunstroke

noun

1. Heat stroke caused by an excessive exposure to the sun's rays.

   “Idiopathic non-septic periencephalitis may be produced by profound grief, protracted anxiety, especially when accompanied by great overwork, partial starvation combined with the gnawing anxiety of deep poverty, and also, it is affirmed, by sunstroke.”

   “Later came midsummer, with the stifling heat, when the dingy killing beds of Durham’s became a very purgatory; one time, in a single day, three men fell dead from sunstroke.”