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A hot spring that discharges intermittent jets of steam and water is called a geyser. Geysers are generally associated with recent volcanic activity. They are produced by the heating of underground waters that have come into contact with, or are very close to, magma. Geyser discharges as high as 1,600 ft (500 m) have been recorded, but 160 ft (50 m) is much more common. Occasionally, a geyser will adopt an extremely regular and predictable pattern of intermittent activity and discharge for a few minutes every hour or so (for example, Old Faithful in Yellowstone National Park).
Examples of geyser in a Sentence
Anna Marie De La Fuente, Variety, 6 May 2026
On Monday, May 4, the hikers were traveling along the national park’s Mystic Falls Trail near Old Faithful geyser, according to a news release by the National Park Service (NPS).
—Paloma Chavez, PEOPLE, 6 May 2026
The attack happened on Mystic Falls Trail near the ever-popular Old Faithful geyser in Wyoming, the park service said.
—Phil Helsel, NBC news, 6 May 2026
Recorded on five reel-to-reel decks, the composer’s 1975 piece blends everyday and exotic sounds—human breath, cheeping frogs, bubbling geysers—into a passionate defense of the raptures of listening.
—Joshua Minsoo Kim, Pitchfork, 28 Apr. 2026
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Cite this Entry
“Geyser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/geyser. Accessed 16 May. 2026.
Copy CitationKids Definition
geyser
noun
from Icelandic Geyser "a hot spring in Iceland," from geysa "to rush forth"
