/ Dictionary / Index G Geiger-Müller tube: Meaning and Definition of Find definitions for: Gei'ger-Mül'ler tube" Pronunciation: [key] — Physics. Physics. a tube functioning as an ionization chamber within a Geiger counter. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Geiger-Müller threshold Geikie Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language