Cite
 

Meaning of Tonkin

Ton•kin

Pronunciation: (ton'kin', tong'-), [key]
— n.
  1. a former state in N French Indochina, now part of Vietnam.
  2. an arm of the South China Sea, W of Hainan. 300 mi. (485 km) long.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.