from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A natural hot spring that intermittently ejects a column of water and steam into the air.
- n. Chiefly British A gas-operated hot-water heater.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A boiling natural spring which throws forth at frequent intervals jets of water, mud etc., driven up by the expansive power of steam.
- n. An instantaneous, and often dangerous, hot water heater using hot steam.
- n. A domestic water boiler.
from the GNU version of the Collaborative International Dictionary of English
- n. A boiling spring which throws forth at frequent intervals jets of water, mud, etc., driven up by the expansive power of steam.
from The Century Dictionary and Cyclopedia
- n. A spouting hot spring; a hot spring which projects water, either periodically or irregularly, to some height in the air.
- n. A gas-burning apparatus attached to a bath for the purpose of heating water for the bath.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a spring that discharges hot water and steam
- v. to overflow like a geyser
After Icelandic Geysir, name of a hot spring of southwest Iceland, from geysa, to gush, from Old Norse.(American Heritage® Dictionary of the English Language, Fourth Edition)
From around 1755-1765, from the Icelandic proper name Geysir, which means and is the name of a hot spring in Iceland (Geysir’s English Wikipedia article). The word geysir literally means gusher, derived from the Icelandic verb geysa ("to gush"), descended from Old Norse geysa ("to gush"). (Wiktionary)