Meaning of hypabyssal
Pronunciation: (hip"u-bis'ul, hī"pu-), [key]
— adj. Geol.
- (of an igneous rock) intermediate in texture between coarse-grained intrusive rocks and fine-grained extrusive rocks.
- noting any of various minor intrusions, as dikes and sills, that have crystallized under conditions intermediate between plutonic and extrusive.