Definitions for "Hypabyssal"
A general adjective applied to minor intrusions such as sills and dykes, and to the rocks that compose them. Hypabyssal rocks are those that have risen from the depths as magma but solidified mainly as minor intrusions such as dykes and sills before reaching the surface.
A shallow intrusion of magma or the resulting solidified rock.
dealing with eruptive rocks emplaced at shallow depths, often related to volcanic activity.