semi-detached

adjective

1. partly detached.
2. of or relating to a house joined by a party wall to another house or row of houses.

adjective

1. 1. (of a building) joined to another on one side by a common wall
   2. (as noun)they live in a suburban semidetached

adj.in reference to houses, 1845, from semi- + past participle of detach (v.). The “Detached House” bears its peculiar characteristic on its front; it stands alone, and nothing more can be said about it; but with the “semi-detached house” there is a subtle mystery, much to be marvelled at. Semi-detached! Have the party-walls between two houses shrunk, or is there a bridge connecting the two, as in Mr. Beckford’s house in Landsdown Crescent, Bath? A semi-detached house may be a house with a field on one side and a bone-boiling factory on the other. Semi-detached may mean half-tumbling to pieces. I must inquire into it. [“Houses to Let,” in “Household Words,” March 20, 1852]