hyp·a·bys·sal (h p  -bs l, h p-)adj. Geology Solidifying chiefly as a minor intrusion, especially as a dike or sill, before reaching the earth's surface. Used of rocks. hyp a·byssal·ly adv. |
hypabyssal [ˌhɪpəˈbɪsəl]
adj
(Earth Sciences / Geological Science) (of igneous rocks) derived from magma that has solidified at shallow depth in the form of dykes, sills, etc.
[from hyp- + -abyssal]
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