Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: From such a pair (Chang and Eng) who were born in Siam (now Thailand)

Siamese twin

 noun
     
Siamese twin [countable usually plural]
one of two people who are born joined to each other - sometimes considered offensive [= conjoined twin]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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