1. a natural hot spring that periodically shoots a column of water and steam into the air
2. a water heater that heats water as it flows through
Usage: British

Examples

• Old Faithful is the most famous geyser in Yellowstone National Park.
• The geyser erupted every two hours, sending water 50 feet into the air.
• Tourists gathered around the geyser to watch its spectacular display.
• Iceland has many active geysers due to its volcanic activity.
• The geyser in our bathroom provides hot water for showers.
• We need to replace the old geyser because it’s not heating water properly.