hypabyssal

adjective hyp·abys·sal \ˌhi-pə-ˈbi-səl, ˌhī-\

Definition of HYPABYSSAL

: of or relating to a fine-grained igneous rock usually formed at a moderate distance below the surface

— hyp·abys·sal·ly \-sə-lē\ adverb

International Scientific Vocabulary

First Known Use: 1895

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