summerhousesummerhouse means A house owned not as a primary residence and used as vacation home during warm weather months of the year. Lexicurio rates it Rare gem — a strength score of 82 out of 100.EtymologyFrom Middle English somer-hous, from Old English sumerhūs, sumorhūs, equivalent to summer + house. Compare Dutch zomerhuis, German Sommerhaus, Danish sommerhus, Swedish sommarhus.nounA house owned not as a primary residence and used as vacation home during warm weather months of the year.An outbuilding in a garden where the owners can relax in warm weather.“"When he had religion he used to be always hammerin' up seats and summer-houses and things out of bits of twisty wood. Mad over that, he was."”