n.
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/ˈgiːzə, ˈgʌɪ-/
a hot spring in which water intermittently boils, sending a tall column of water and steam into the air.
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/ˈgiːzə/
Brit. a gas-fired water heater through which water flows as it is heated.
Etymology
C18: from Icelandic Geysir, the name of a particular spring in Iceland; rel. to geysa ‘to gush’.
