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 steam2British : an apparatus for heating water rapidly with a gas flame (as for a bath)