summerhouse Syllabification: (sum·mer·house)Pronunciation: /ˈsəmərˌhous/ (also summer house)Translate summerhouse | into French | into Spanish Definition of summerhouse noun a small, typically rustic building in a garden or park, used for sitting in during the summer months. (usually summer house) a cottage or house use as a second residence, especially during the summer. summerhouse in other Oxford dictionaries Definition of summerhouse in the British & World English dictionary