[sahy-uh-meez, -mees]
  1. of or relating to Siam, its people, or their language.
  2. Thai(def 3).
  3. twin; closely connected; similar.
  4. Informal. dual; combined; twofold or two-way: a Siamese sprinkler.
noun, plural Si·a·mese.
  1. a native of Siam.
  2. Thai(def 2).
  3. Siamese cat.
  4. (usually lowercase) a standpipe placed outside a building close to ground level, having two or more openings so that fire engines can pump water to the sprinkler system of the building.

Origin of Siamese

First recorded in 1685–95; Siam + -ese Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for siamese

Contemporary Examples of siamese

Historical Examples of siamese

British Dictionary definitions for siamese


noun plural -mese
  1. See Siamese cat
  1. characteristic of, relating to, or being a Siamese twin
adjective, noun
  1. another word for Thai
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for siamese



"of or pertaining to Siam," 1690s; see Siam + -ese. Also from 1690s as a noun meaning "native of Siam." the original Siamese twins (exhibited from 1829) were Chang and Eng (1814-1874), Thai-Chinese natives of Siam who settled in the U.S. Hence Siamesed (adj.) "joined in the manner of Siamese twins" (1830). Siamese cat is attested from 1871.

Online Etymology Dictionary, © 2010 Douglas Harper