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New American Oxford Dictionary

diatreme

di a treme |ˈdīəˌtrēm ˈdaɪətrim | noun Geology a long, vertical pipe or plug formed when gas-filled magma forced its way up through overlying strata. ORIGIN early 20th cent.: from dia- through + Greek trēma perforation.

 

Oxford Dictionary

diatreme

diatreme |ˈdʌɪətriːm | noun Geology a long vertical pipe or plug formed when gas-filled magma forced its way up through overlying strata. ORIGIN early 20th cent.: from dia- through + Greek trēma perforation .