Pronunciation: (gī'zur, -sur for 1, 3; gē'zur for 2),[key] —n. 1. a hot spring that intermittently sends up fountainlike jets of water and steam into the air.
2. Brit. Informal.a hot-water heater, as for a bath.
—v.i. to spew forth as or like a geyser: the kettle geysering all over the stove.