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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

The 23-year-old Thai began the final day with a two-stroke lead and went on to clinch the top prize at the Siam Country Club Old Course in the coastal resort Pattaya.

From Barron's Feb. 22, 2026

Tavatanakit had a three-round total of 16-under 200 on the Siam Country Club Old Course at Chonburi southeast of Bangkok.

From Seattle Times Feb. 24, 2024

In case you were wondering, there is a Four Seasons Resort in Koh Samui, where guests can stay in private villas overlooking the Gulf of Siam.

From Los Angeles Times Jan. 6, 2024

“That must go to New York, the shoes for Toulouse, the ham for Siam, the nails from Wales, and the tangerines for New Orleans.”

From "Catch-22" by Joseph Heller

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