noun
dormant volcano
A volcano that is not currently erupting but is expected to erupt again in the future. In modern volcanology, the term is sometimes replaced by more precise classifications, but it remains in common use.
富士山は休火山に分類されることもある。
Mount Fuji is sometimes classified as a dormant volcano.
死火山 is an extinct volcano that is not expected to erupt again, unlike 休火山 which is merely resting.
Compound of 休 (rest) and 火山 (volcano), literally 'resting volcano'.