geyser
US /ˈɡaɪ.zɚ/
UK /ˈɡaɪ.zɚ/
1.
a hot spring in which water intermittently boils, sending a tall column of water and steam into the air
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Old Faithful is a famous geyser in Yellowstone National Park.
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The eruption of the geyser was a spectacular sight.
2.
a water heater
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The old geyser in the basement needs to be replaced.
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We had no hot water because the geyser broke down.