phreatomagmatic
/frɪˌætəʊmægˈmætɪk/adjective
- Geology (of a volcanic eruption) in which both magmatic gases and steam from groundwater are expelled【地质】（火山喷发）潜水-岩浆相互作用的, 岩浆蒸气喷发的。
词源
mid 20th cent.: from Greek phrear, phreat- 'a well'+ magmatic （see MAGMA）.