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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, gold, Forrestania Resources and more in the latest Market Talks covering basic materials.

From The Wall Street Journal Jul. 14, 2026

"We see the official holding the red flag which means the track was not safe but we also see that the train did not stop or slow down, causing the crash," Siam said.

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

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

I learn that Burma is the largest country in Southeast Asia, that it borders India and China and Siam.

From "Orphan Train" by Christina Baker Kline

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