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Siamese twin

(not in technical use) conjoined twin.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for siamese twins
Historical Examples
  • She did but one good thing, and that was to teach the siamese twins how to die.

  • He was mortified by his forgetfulness, but the ladies were after all not siamese twins.

    Aurora the Magnificent Gertrude Hall
  • They must, I supposed, have been some sport of growth, siamese twins of vegetation.

    The Club of Queer Trades G. K. Chesterton
  • That the siamese twins were joined together by gutta percha moulded and painted to look like a shoulder blade.

    The American Credo George Jean Nathan
  • If we have a fancy dress party this year you two can surely go as the siamese twins.

    Marjorie Dean Pauline Lester
  • The siamese twins gave him a good opening about 'bonds eternal' and the 'season vernal' and he didn't do a thing with it.

    Side Show Studies Francis Metcalfe
  • Science and art are inseparably connected; like the siamese twins, they cannot be separated without producing the death of both.

    The Uses of Astronomy

    Edward Everett
  • These were each driven by an electric motor, and were termed "The siamese twins," due to the way in which they were connected.

    Steam Turbines Hubert E. Collins
  • Even a republic in Siam would not have done much towards freeing the siamese twins.

    What's Wrong With The World G.K. Chesterton
  • siamese twins you've been called ever since born you was; dressed alike, fed alike, and reared alike; and now look at you!

    The Wooing of Calvin Parks Laura E. Richards
British Dictionary definitions for siamese twins

Siamese twins

plural noun
non-technical name for conjoined twins
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
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siamese twins in Medicine

Siamese twin Si·a·mese twin (sī'ə-mēz', -mēs')
Either of a pair conjoined twins. No longer in technical use.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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