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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.

Bangkok police chief Siam Boonsom said Sunday that there was traffic congestion at the crossing daily, but never an accident.

From Barron's • May 18, 2026

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

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

He explained that many of the countries, like Siam and Italian Somaliland, no longer existed in the same way; the names had changed by now.

From "Interpreter of Maladies" by Jhumpa Lahiri

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