[gahy-zer, -ser for 1, 3; gee-zer for 2] 
| 1. | a hot spring that intermittently sends up fountainlike jets of water and steam into the air. |
| 2. | British Informal. a hot-water heater, as for a bath. |
| 3. | to spew forth as or like a geyser: the kettle geysering all over the stove. |
| gey·ser (gī'zər) n.
[After Icelandic Geysir, name of a hot spring of southwest Iceland, from geysa, to gush, from Old Norse; see gheu- in Indo-European roots.] |
