heliosis

plural helioses

1. uncountableusuallySunstroke.
2. uncountableusuallySunburn.
3. uncountableusuallyExposure to the sun.
4. uncountableusuallyScorching of plants by the sun.
5. historicaluncountableusuallyA sunroom or solarium of the Ancient Greeks.

   The Greeks and Romans constructed in their homes special sun parlors (called helioses or thermae).

   1933, Frank Hammond Krusen, Light Therapy, page 4

   1 more example

   The Greeks had their helioses and the Romans their solaria; yet heliotherapy has as yet scarcely emerged from the most empiric of performances into the dignity of a scientifically justified or rationalized procedure.

   1925, Hobart Amory Hare, Progressive Medicine, page 219