Tonkin

noun5

1. •
   (historical) A former protectorate in northern Vietnam, a colony of France.
2. •
   Ellipsis of the Gulf of Tonkin: a gulf in northern Vietnam.
3. •
   Ellipsis of Gulf of Tonkin incident, a 1964 event used to increase US involvement in the Vietnam War.
4. •
   A surname transferred from the given name.
5. •
   (no longer used) Synonym of Hanoi, the capital of Vietnam.