noun
- A geyser in Yellowstone National Park that erupts for about 4 minutes about every 65 minutes. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). old faithful. Retrieved September 21, 2026, from http://smartdefine.org/old_faithful/definitions/1227251 |
| Chicago | WordNet. 2010. "old faithful" http://smartdefine.org/old_faithful/definitions/1227251 (accessed September 21, 2026). |
| Harvard | WordNet 2010, old faithful, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/old_faithful/definitions/1227251>. |
| MLA | WordNet. "old faithful" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/old_faithful/definitions/1227251> |