gey ‧ ser /ˈɡiːzə $ ˈɡaɪzər/ BrE AmE noun [countable]
[ Date: 1700-1800 ; Language: Icelandic ; Origin: Geysir , name of a hot spring in Iceland, from geysa 'to flow out quickly' ]
1 . a natural spring that sends hot water and steam suddenly into the air from a hole in the ground
2 . British English a machine fixed to a wall over a bath or ↑ sink and used for heating water