conjoined twins

World English Dictionary
conjoined twins
 
pl n
Non-technical name: Siamese twins twin babies born joined together at some point, such as at the hips. Some have lived for many years without being surgically separated

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American Heritage
Medical Dictionary

conjoined twins pl.n.
Identical twins born with their bodies joined at some point and having varying degrees of residual duplication, a result of the incomplete division of the ovum from which the twins developed. Also called diplosomia.

The American Heritage® Stedman's Medical Dictionary
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