[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.
verb (used without object)
  1. to spew forth as or like a geyser: the kettle geysering all over the stove.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for geyser

gusher, spout, jet

Examples from the Web for geyser

Contemporary Examples of geyser

Historical Examples of geyser

British Dictionary definitions for geyser


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

Word Origin for geyser

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)).

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.