Siamese
1 of 2adjective
Si·a·mese ˌsī-ə-ˈmēz 
-ˈmēs
-ˈmēs 1
: of, relating to, or characteristic of Thailand, the Thais, or their language
2
: exhibiting great resemblance : very like
3
not capitalized : connecting two or more pipes or hoses so as to permit discharge in a single stream
Siamese
2 of 2noun
plural Siamese
1
: thai sense 2
2
: thai sense 3
3
: siamese cat
Word History
Etymology
Adjective
Siam (Thailand); in senses 2 & 3, from Siamese twin
First Known Use
Adjective
1693, in the meaning defined at sense 1
Noun
1693, in the meaning defined at sense 1