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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

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

“They were innocent people,” said Hussein Siam, whose relatives were among the dead.

From Seattle Times • Dec. 31, 2023

Hamas said that he was killed along with three other senior militants, including Ayman Siam, who Israel says was in charge of Hamas’ rocket-firing unit.

From Washington Times • Nov. 26, 2023

In the fifteenth century, Angkor Wat was abandoned to the jungles after an invasion by Siam and forgotten about until French explorers rediscovered it in the nineteenth century.

From "First They Killed My Father: A Daughter of Cambodia Remembers" by Loung Ung