Wiktionary
conjoined twin
n. One of the two identical twins who are born attached together in utero
WordNet
conjoined twin
n. one of a pair of identical twins born with their bodies joined at some point [syn: Siamese twin]
Usage examples of "conjoined twin".
A blanket of fog lay over the Bay and from Pacific Heights the great orange towers of the Golden Gate Bridge jutted through the fog bank like carrots from the faces of sleeping conjoined twin snowmen.