hot springs that periodically erupt, shooting hot water and steam high into the air; or anything that shoots out forcefully and suddenly.
From Icelandic 'geyser,' from Old Norse 'geysa' meaning 'to gush or spurt.' Named after the Great Geyser in Iceland, which became famous among European travelers.
Old Faithful in Yellowstone erupts roughly every 90 minutes with amazing regularity—it's powered by water percolating down to super-heated underground chambers, making it a natural thermodynamic marvel.
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