/ Dictionary / Index W Welsbach burner: Meaning and Definition of Find definitions for: Wels'bach burn"er Pronunciation: (welz'bak, -bäk Ger. vels'bäkh), [key] — Trademark. Trademark. a brand of gaslight consisting essentially of a Bunsen burner on which an incombustible mantle composed of thoria and some ceria becomes brilliantly incandescent when exposed to flame. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. well-worn welsh Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language