[suhn-room, -room]
a room designed to admit a large amount of sunlight; sun parlor or sun porch.

1920–25, Americanism; sun + room Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sunroom (ˈsʌnˌruːm, ˈsʌnˌrʊm)
a room or glass-enclosed porch designed to display beautiful views, to admit and retain the sun's heat in cool countries, and reflect it away in warm countries

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica


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
Move the tree to a greenhouse or cool, bright location, such as a sunroom.
Removing the piece of paper from the pad, he crosses the sunroom and discreetly
  slips it into my palm.
He likes do-it-yourself projects and spent many weekends turning a deck off his
  house into a sunroom.
The building's interior includes a sunroom, a grand salon and marble staircases.
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