siriasis Meaning, Definition & Usage

  1. noun sudden prostration due to exposure to the sun or excessive heat
    thermic fever; insolation; sunstroke.

WordNet

Si*ri"a*sis noun
Etymology
L., fr. Gr. , fr. the Dog Star, properly, scorching.
Definitions
  1. (Med.) (a) A sunstroke. (b) The act of exposing to a sun bath. Obs. Cf. Insolation.

Webster 1913