/ Dictionary / Index T Tonkin: Meaning and Definition of Find definitions for: Ton•kin Pronunciation: (ton'kin', tong'-), [key] — n. a former state in N French Indochina, now part of Vietnam. 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. tonka bean Tonle Sap Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language