/ Dictionary / Index T Thelon: Meaning and Definition of Find definitions for: The•lon Pronunciation: (thē'lon), [key] — n. a river in the SE Northwest Territories, in central Canada, flowing NE into Hudson Bay. ab. 550 mi. (885 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thelma T helper cell Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language