Siam

[ sahy-am, sahy-am ]
/ saɪˈæm, ˈsaɪ æm /

noun

former name of Thailand(def 1).
Gulf of, Thailand(def 2).

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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
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Example sentences from the Web for siam

British Dictionary definitions for siam

Siam
/ (saɪˈæm, ˈsaɪæm) /

noun

the former name (until 1939 and 1945–49) of Thailand
Gulf of Siam an arm of the South China Sea between the Malay Peninsula and Indochinathe former name of (the Gulf of) Thailand (def. 2)
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