noun
geyser
A hot spring that intermittently erupts a column of water and steam.
アイスランドには多くの間欠泉がある。
There are many geysers in Iceland.
間欠泉が突然噴き上がった。
The geyser suddenly erupted.
Standard modern kanji spelling.
Older variant using 歇 (kyūjitai/rare kanji).
温泉 is a general hot spring, while 間欠泉 specifically refers to a geyser that erupts intermittently.
Compound of 間欠 (intermittent) + 泉 (spring). The spelling 間歇泉 uses the older form 歇 for 欠.