Siamese twins

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Siamese twins:

see conjoined twinsconjoined twins,
congenitally united organisms that are complete or nearly complete individuals, historically known as Siamese twins. They develop from a single fertilized ovum that has divided imperfectly; complete division would produce identical twins, having the same sex and
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Siamese twins

[′sī·ə‚mēz ′twinz]
(medicine)
Viable conjoined twins.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Siamese twins

Eng and Chang (1814–74), the original pair, were connected at the chest. [Medical Hist.: Brewer Dictionary, 828]
See: Twins
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.