Siamese twin

noun

Definition of Siamese twin 

: one of a pair of congenitally united twins

First Known Use of Siamese twin

1829, in the meaning defined above

History and Etymology for Siamese twin

from Chang †1874 and Eng †1874 congenitally united twins born in Siam

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The first known use of Siamese twin was in 1829

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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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