• synonyms


[gahy-zer, -ser for 1, 3; gee-zer for 2]
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  1. a hot spring that intermittently sends up fountainlike jets of water and steam into the air.
  2. British Informal. a hot-water heater, as for a bath.
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verb (used without object)
  1. to spew forth as or like a geyser: the kettle geysering all over the stove.
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Origin of geyser

1755–65; < Icelandic Geysir name of a hot spring in Iceland, literally, gusher, derivative of geysa to gush
Related formsgey·ser·al, gey·ser·ic, adjective
Can be confusedcaldera fumarole geyser volcano
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for geyser


  1. a spring that discharges steam and hot water
  2. British a domestic gas water heater
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Word Origin

C18: from Icelandic Geysir, from Old Norse geysa to gush
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for geyser


1780, from Icelandic Geysir, name of a hot spring in the valley of Haukadal, literally "the gusher," from Old Norse geysa "to gush," from Proto-Germanic *gausjan, from PIE *gheus-, from root *gheu- "to pour" (see found (v.2)).

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Online Etymology Dictionary, © 2010 Douglas Harper

geyser in Science


  1. A natural hot spring that regularly ejects a spray of steam and boiling water into the air.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.