/ Dictionary / Index T tolan: Meaning and Definition of Find definitions for: to•lan Pronunciation: (tō'lan), [key] — n. Chem. a crystalline, water-insoluble, solid, unsaturated compound, CH, used chiefly in organic synthesis. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tola Toland Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language