Main Entry: gey·ser

Pronunciation: \ˈgī-zər, British sometimes ˈgā- or ˈgē- for 1 & usually ˈgē- for 2\

Function: noun

Etymology: Icelandic Geysir, hot spring in Iceland, from geysa to rush forth, from Old Norse; akin to Old English gēotan to pour — more at found

Date: 1780

1 : a spring that throws forth intermittent jets of heated water and steam
2 British : an apparatus for heating water rapidly with a gas flame (as for a bath)