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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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The region concerned used to be part of the former Malay-Muslim Patani sultanate but was annexed in the early 1900s by Buddhist-majority Thailand -- then Siam -- following an agreement with colonial power Britain.

From Barron's ● Aug. 26, 2026

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

From The Wall Street Journal ● Jul. 14, 2026

In a clothing shop in Siam Square, a commercial hub in Thailand’s capital, the happy couple excitedly eyed multi-colored garments as they discussed their potential wedding.

From Seattle Times ● Dec. 19, 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

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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