gey·​ser ˈgī-zər How to pronounce geyser (audio)
 British also  ˈgē-zə,
 for sense 1 and usually  for sense 2 ˈgē-zə
: a spring that throws forth intermittent jets of heated water and steam
British : an apparatus for heating water rapidly with a gas flame (as for a bath)

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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

The water from the geyser rises as high as 75 feet. geysers rising as high as 75 feet The water shot into the sky in an enormous geyser.
Recent Examples on the Web Recent research on Cassini data revealed that the geysers also contain phosphorus, which is another crucial element for creating life (and likely the rarest of the bunch). Popular Science Staff, Popular Science, 22 May 2024 General Daily Insight for April 10, 2024 Emotions may erupt like geysers., Baltimore Sun, 10 Apr. 2024 The scene turns chaotic as the boats speed through the curve within yards of each other and geysers of whitewater and churning wakes fill the space around them. J. George Gorant, Robb Report, 9 May 2024 The emerging gas is full of dark dust and shoots up through cracks in the ice similar to a fountain or geyser. Laura Baisas, Popular Science, 25 Apr. 2024 See all Example Sentences for geyser 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'geyser.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Icelandic Geysir, hot spring in Iceland, from geysa to rush forth, from Old Norse; akin to Old English gēotan to pour — more at found

First Known Use

1780, in the meaning defined at sense 1

Time Traveler
The first known use of geyser was in 1780

Dictionary Entries Near geyser

Cite this Entry

“Geyser.” Dictionary, Merriam-Webster, Accessed 16 Jun. 2024.

Kids Definition


gey·​ser ˈgī-zər How to pronounce geyser (audio)
: a spring that now and then shoots out hot water and steam

from Icelandic Geyser "a hot spring in Iceland," from geysa "to rush forth"

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