Definition of Old Faithful in English:

Old Faithful

Syllabification: Old Faith·ful
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).

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal