The word solarium (pl -lariums or -laria) is Latin and means terrace or flat housetop from the Latin word sol meaning sun. It has several meanings:

• the name of a former constellation
• A solarium is a room built largely of glass to afford exposure to the sun. A common example of this is a glassed-in porch.
• Solarium is another word for sunbed and is also used when referring to establishments offering these facilities.

Solariums today are commonly found in fast food restaurants (e.g. Wendy's). During the 60's and 70's, Rax Restaurants became one of the first fast food chains to build solariums in its dining areas.

Solarium | Wintergarten | Solarium | Serre