solarium

[suh-lair-ee-uhm, soh-]
noun, plural solariums, solaria [suh-lair-ee-uh, soh-] .
a glass-enclosed room, porch, or the like, exposed to the sun's rays, as at a seaside hotel or for convalescents in a hospital.

Origin:
1815–25; < Latin sōlārium balcony, terrace, equivalent to sōl the sun + -ārium -ary

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Collins
World English Dictionary
solarium (səʊˈlɛərɪəm)
 
n , pl -lariums, -laria
1.  a room built largely of glass to afford exposure to the sun
2.  a bed equipped with ultraviolet lights used for acquiring an artificial suntan
3.  an establishment offering such facilities
 
[C19: from Latin: a terrace, from sōl sun]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

solarium
1891, "part of a house exposed to the sun," earlier "sundial" (1842), from L. solarium "sundial," also "a flat housetop," lit. "that which is exposed to the sun," from sol "sun" (see sol).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

solarium

in architecture, any room that is exposed to the sun. While the term may also be applied to the open sunporches or apartments on the roofs of ancient Greek or Roman houses, it is now used especially to designate a room that is enclosed in glass. In such a solarium, three or possibly four walls and sometimes even the ceiling may all be of glass. Often the solarium is a feature of a hospital or sanitarium, a room in which patients may be exposed to sunlight in a controlled environment as part of their therapy.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The hotel has a large solarium with views of the city.
During bad weather, they were put up in the solarium.
The cheerful solarium showcases seasonal exhibits including butterfly rearing.
The entryway from the solarium is segmentally arched, as is the solarium
  entrance to the library.
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