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Siamese

[sahy-uh-meez, -mees] /ˌsaɪ əˈmiz, -ˈmis/
adjective
1.
of or pertaining 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 Siamese.
5.
a native of Siam.
6.
Thai (def 2).
8.
(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
1685-1695
1685-95; Siam + -ese
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Siamese

Siamese

/ˌsaɪəˈmiːz/
noun (pl) -mese
1.
adjective
2.
characteristic of, relating to, or being a Siamese twin
adjective, noun
3.
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
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Word Origin and History for Siamese
Siamese
1693, "native of Siam" (as Thailand was called before 1939 and again from 1945-48); the original Siamese twins (1829) were Chang and Eng (1814-74), natives of Siam. Siamese cat is attested from 1871.
Online Etymology Dictionary, © 2010 Douglas Harper
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