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Siamese twin
Si·a·mese twin


noun 
Definition:
 
( informal )
Same as  conjoined twin
[After twins, Chang and Eng (1811-1874), born in Siam (Thailand)]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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