- A boiling spring which throws forth at frequent intervals jets of water, mud, etc., driven up by the expansive power of steam.
- (context, British, archaic) An instantaneous, and often dangerous, hot water heater.
- 1902: William Paton Buchan, Plumbing: A Text-book to the Practice of the Art Or Craft of the Plumber - Where a Geyser or hot-water heater is used it is a good and wise precaution to see that the bath-room, &c., when it is used is well ventilated.
- 1998: Gordon S Riess, Confessions of a Corporate Centurion: Tales of International Adventures - Water was heated either on the gas stove, or on a wall mounted gas-fired "" heater.
- 2002: Alaine Polcz, One woman in the war: Hungary, 1944-1945 - It was here I saw a gas water heater in a bathroom for the first time. (I was afraid of it).
Etymology: From Icelandic Geysir, a proper name meaning "gusher" designating a famous geyser in the south of Iceland. In use in English since the 19th century.
- German: Geysir
- Spanish: géiser
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