Definition of Old Faithful in English:

Old Faithful

Pronunciation /əo͝oldˈfāTHfl/ /əʊldˈfeɪθfl/

proper noun

  • One of the best-known geysers in Yellowstone National Park. Its eruptions occur every 33 to 90 minutes and last about four minutes, sending up a column of hot water and steam that rises 116 to 175 feet (35.4 to 53.4 m).