a former country in SE Asia that comprised Vietnam S of about 17° N latitude; a separate state 1954–75; now part of reunified Vietnam. Capital: Saigon.
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British Dictionary definitions for south vietnam
a former republic (1955–76) occupying the S of present-day Vietnam on the South China Sea and 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