[ gahy-zer, -ser for 1, 3; gee-zer for 2 ]
/ ˈgaɪ zər, -sər for 1, 3; ˈgi zər for 2 /


a hot spring that intermittently sends up fountainlike jets of water and steam into the air.
British Informal. a hot-water heater, as for a bath.

verb (used without object)

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 forms

gey·ser·al, gey·ser·ic, adjective

Can be confused

caldera fumarole geyser volcano Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for geyser

British Dictionary definitions for geyser


/ (ˈɡiːzə, US ˈɡaɪzər) /


a spring that discharges steam and hot water
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

Science definitions for geyser


[ gīzər ]

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.