Siamese twins

Siamese twins

noun
1.
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.
2.
any twins who are born joined together in any manner.

Origin:
1820–30

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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]

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