Siamese twins

congenitally united twins, Chang and Eng (1811–74), born in Siam, who were joined to each other at the chest by a short, tubular, cartilaginous band.
any twins who are born joined together in any manner.

1820–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Siamese twins
pl n
non-technical name for conjoined twins
[C19: named after a famous pair of conjoined twins, Chang and Eng (1811--74), who were born in Siam]

Collins English Dictionary - Complete & Unabridged 10th Edition
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