Siamese twin

Etymology
Chang and Eng Bunker, conjoined twins from Siam (modern Thailand), were known as the "Siamese twins".

Noun

 * 1) A conjoined twin; one of two people physically joined together.
 * 2)  Either of a pair of words that occur together as an idiomatic expression or collocation, as in "hammer and sickle", "short and sweet", or "spick and span".
 * 1)  Either of a pair of words that occur together as an idiomatic expression or collocation, as in "hammer and sickle", "short and sweet", or "spick and span".

Usage notes
Some consider the term "Siamese twin" to be offensive, as it inordinately links Thais and Thailand to the birth defect.

Translations

 * Danish: siamesisk tvilling
 * Dutch: Siamese tweeling
 * Esperanto: siama ĝemelo
 * French: frère siamois, sœur siamoise
 * German:
 * Hungarian: sziámi iker
 * Indonesian:
 * Kurdish:
 * Northern Kurdish:, hevalcêmkên pêkve
 * Malay: kembar Siam
 * Mongolian: сиамын ихэр
 * Norwegian:
 * Bokmål: siamesisk tvilling
 * Nynorsk: siamesisk tvilling
 * Polish: bliźnię syjamskie
 * Portuguese: gémeo siamês, gêmeo siamês
 * Romanian: geamăn siamez, geamănă siameză
 * Russian: сиа́мский близне́ц
 * Spanish: siamés
 * Swedish: siamesisk tvilling
 * Turkish: Siyam ikizi, yapışık ikiz, Siyamlı ikiz