Sem·i·de·tached a. Half detached; partly distinct or separate.
  Semidetached house, one of two tenements under a single roof, but separated by a party wall. [Eng.]
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  semi-detached house
       n : a dwelling that is attached to something on only one side
  semidetached house
       n : a house with two units sharing a common wall [syn: duplex
           house, duplex]