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The Collaborative International Dictionary of English v.0.48 (gcide)

Geyser \Gey"ser\, n. [Icel. geysir, fr. geysa to rush furiously,
fr. gj[=o]sa to gush. Cf. {Gush}.]
A boiling spring which throws forth at frequent intervals
jets of water, mud, etc., driven up by the expansive power of
steam.
[1913 Webster]

Note: Geysers were first known in Iceland, and later in New
Zealand. In the Yellowstone region in the United States
they are numerous, and some of them very powerful,
throwing jets of boiling water and steam to a height of
200 feet. They are grouped in several areas called
geyser basins. The mineral matter, or geyserite, with
which geyser water is charged, forms geyser cones about
the orifice, often of great size and beauty.
[1913 Webster]