n. & adj.
n. (pl. same) 1 a a native of Siam (now Thailand) in SE Asia. b the language of Siam. 2 (in full Siamese cat) a a cat of a cream-coloured short-haired breed with a brown face and ears and blue eyes. b this breed.
adj. of or concerning Siam, its people, or language. Siamese twins 1 twins joined at any part of the body and sometimes sharing organs etc. 2 any closely associated pair.