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Siamese twins

plural noun

  1. non-technical name for conjoined twins
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of Siamese twins1

C19: named after a famous pair of conjoined twins, Chang and Eng (1811–74), who were born in Siam

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Siamese twinSian