Of a house: joined to another one on one side, having one shared wall.(adjective)
Such a house.(noun)
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Use "semi-detached" in a sentence
"If you type in “21 Mt Nod Road” there, and then choose the now infamous “Street View”, you get No. 12 (it claims in the caption), semi-detached and having a bin out in front with “9” on it."
"The detached and semi-detached houses for sale range in price from € 147,500 to € 229,950."
"For $729,000 you might find a semi-detached house, on a 20' x 100' lot, that needs to be fully gutted and rebuilt."