• synonyms

Siamese twin

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  1. (not in technical use) conjoined twin.
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Origin of Siamese twin

First recorded in 1820–30; named after congenitally united twins, Chang and Eng (1811–74), born in Siam, who were joined to each other at the chest
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for siamese twins

Siamese twins

pl n
  1. non-technical name for conjoined twins
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Word Origin

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

siamese twins in Medicine

Siamese twin

  1. Either of a pair of conjoined twins. No longer in technical use.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.