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siamese twin

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Siamese twin  
n.  Either of a pair of identical twins born with their bodies joined at some point, a result of the incomplete division of the ovum from which the twins developed.

[After Chang and Eng Bunker (1811-1874), joined Chinese twins born in Siam (Thailand).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: Si·a·mese twin
Pronunciation: 'sI-&-"mEz-, -"mEs-
Function: noun
: either of a pair of conjoined twins
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

Siamese twin Si·a·mese twin (sī'ə-mēz', -mēs')
n.
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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