Definition of solarium noun from the Oxford Advanced Learner's Dictionary

 

solarium

 noun
noun
BrE BrE//ˈleəriəm//
 
; NAmE NAmE//ˈleriəm//
 
 
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a room whose walls are mainly made of glass, or which has special lamps, where people go to get a suntan (= make their skin go brown) using light from the sun or artificial light Word Origin mid 19th cent.: from Latin, literally ‘sundial, place for sunning oneself’, from Latin sol ‘sun’.
See the Oxford Advanced American Dictionary entry: solarium