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“hypabyssally”
hypabyssally (adverb), more hypabyssally, most hypabyssally
Regarding how hard consolidated mineral matter is solidified primarily as a minor intrusion, especially as a dike or sill (a vertical or near-vertical mass of igneous rock that has forced its way upward through overlying strata), before reaching the surface: The hypabyssally formed rock was perceived by the drilling company as a serious impediment to their operations.
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abysso-, abyss-, abys-
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