Siamese twin


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

Si·a·mese twin

noun \ˈsī-ə-ˌmēz-, -ˌmēs-\   (Medical Dictionary)

Medical Definition of SIAMESE TWIN

: either of a pair of conjoined twins

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