/ ˈgiːzə(r); NAmE ˈgaɪzər/ noun
1.
a natural spring that sometimes sends hot water or steam up into the air
2.
( BrE ) a piece of equipment in a kitchen or bathroom that heats water, usually by gas
3.
( SAfrE ) a large container in which water is stored and heated, usually by electricity, in order to provide hot water in a building
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WORD ORIGIN
late 18th cent.: from Icelandic Geysir , the name of a particular spring in Iceland; related to geysa to gush.