earthhouse/ˈɜːθˌhaʊs/EtymologyInherited from Middle English erthe hous, from Old English eorþhūs, from Proto-West Germanic *erþahūs, from Proto-Germanic *erþahūsą, equivalent to earth + house.earthhouse means An underground chamber or habitation; a souterrain. Lexicurio rates it Sui generis — a strength score of 90 out of 100.nounAn underground chamber or habitation; a souterrain.“There were many other heirlooms heaped inside the earth-house, because long ago, with deliberate care, some forgotten person had deposited the whole rich inheritance of a high-born race in this ancient cache.”A dwelling that has been built to blend in with the surrounding landscape, being mostly underground with a grassy contoured roof; it may also be completely underground, or have a topping of intensive growth.