• synonyms

Siamese twin

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  1. 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

siamese twin 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.