Dictionary

Siamese twin

noun

Definition of SIAMESE TWIN

:  one of a pair of congenitally united twins

Origin of SIAMESE TWIN

from Chang †1874 and English †1874 congenitally united twins born in Siam
First Known Use: 1829
Medical Dictionary

Siamese twin

noun Si·a·mese twin \ˈsī-ə-ˌmēz-, -ˌmēs-\

Medical Definition of SIAMESE TWIN

:  either of a pair of conjoined twins

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