• WordNet 3.6
    • n summerhouse a small roofed building affording shade and rest
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Webster's Revised Unabridged Dictionary
    • n Summerhouse A rustic house or apartment in a garden or park, to be used as a pleasure resort in summer.
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Century Dictionary and Cyclopedia
    • n summerhouse A structure in a park or garden, sometimes elaborate, but move often of the simplest character, generally little more than a roof supported on posts, and with the sides open or closed merely with a lattice for the support of vines, intended to provide a shady and cool place to sit in the open air, or for the enjoyment of a view, or the like. Compare kiosk and pavilion.
    • n summerhouse A house for summer residence.
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In literature:

Could this be the summerhouse alluded to?
"Wieland; or The Transformation" by Charles Brockden Brown
I saw the carriage approaching the summerhouse to take us away.
"The Two Destinies" by Wilkie Collins
A summerhouse gave a fine view of the waters of the Yser Canal, which was there quite wide.
"The Great War As I Saw It" by Frederick George Scott
"Young Captain Jack" by Horatio Alger and Arthur M. Winfield
To get out of the rain and rest, Randy took himself to the summerhouse.
"Randy of the River" by Horatio Alger Jr.
There, where a summerhouse stood, on that rocky point, they have got a crane and a windlass.
"Cornelius O'Dowd Upon Men And Women And Other Things In General Originally Published In Blackwood's Magazine - 1864" by Charles Lever
She and her brother were seated in a small summerhouse attached to Clearwater Hall.
"The Rover Boys Under Canvas" by Arthur M. Winfield
The summerhouse remained, and a most unexceptionable path led to it.
"Deerbrook" by Harriet Martineau
All this lay within Mary Louise's field of vision from the summerhouse and yet she saw it not.
"Stubble" by George Looms
On that calm and sunny autumn afternoon, the Prefect was sitting in a classically pillared summerhouse near the open windows of his library.
"Angelot" by Eleanor Price

In news:

The 120-square-foot "summerhouse" is entirely prefabricated (even the ornate lead roof) in the UK and shipped in a box, all finished, painted, and ready to install.
The Summerhouse at Hill- Stead Museum in Farmington, where poets read from during the Sunken Garden Poetry Festival.
From unloved garage to adored summerhouse .
From unloved garage to adored summerhouse.
It's available in three colors: orchard, summerhouse and countryside.
A Harrington summerhouse is an anchor for a pair of academics.