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Siam

American  
[sahy-am, sahy-am] / saɪˈæm, ˈsaɪ æm /

noun

  1. former name of Thailand.

  2. Gulf of, Thailand.


Siam British  
/ ˈsaɪæm, saɪˈæm /

noun

  1. the former name (until 1939 and 1945–49) of Thailand

  2. an arm of the South China Sea between the Malay Peninsula and Indochina the former name of (the Gulf of) Thailand

"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

Example Sentences

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Find insight on Siam Cement, Forrestania Resources, Liontown Resources and more in the latest Market Talks covering basic materials.

From The Wall Street Journal Jul. 14, 2026

Authorities were also investigating the speed of the train and its braking distance, Siam added.

From Barron's May 18, 2026

The Pizza Port Brewing Company and Pizzeria Luigi both have meat and vegan pies, and there are also two Thai restaurants nearby, Aroma Thai and Siam Imperial Kitchen.

From Los Angeles Times Oct. 16, 2024

Gaza City resident Said Siam said prices have dropped in recent weeks.

From Seattle Times May 6, 2024

Locke’s King of Siam case is one where a tacit reserve would have been appropriate, but Locke had not formulated one.

From "The Invention of Science" by David Wootton

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