Siam(the former name of Thailand) proper noun [UK: saɪ.ˈæm] [US: saˈjæm]The term Siamese twins comes from two conjoined twins from Siam who travelled with P.T. Barnum's circus. = El termino gemelos siameses proviene de dos gemelos unidos de Siam que viajaban con el circo de P.T. Barnum.