What does the word sunstroke mean?

Usage examples for sunstroke

  1. Has he caught the plague or got a sunstroke? – Callista by John Henry Cardinal Newman
  2. No use for to get sunstroke. – Across the Fruited Plain by Florence Crannell Means
  3. Bah, I'm not afraid of a sunstroke. – The Iron Furrow by George C. Shedd