[Icel. geyser, from geysa, to gush.] The name applied to hot springs, such as were first observed in Iceland, which eject hot water violently either at irregular intervals or periodically. The Great Geyser in Iceland throws up water to a height of from 80 to 120 feet. There are numerous geysers in the Yellowstone region of the United States, some of which throw jets of water to a height of 200 feet. They are also met with in New Zealand and in California.