Definitions

1. adjective

relating to or of the nature of a hypabyssal rock or body, especially one that has been intruded into pre-existing rocks and has a composition that is intermediate between that of plutonic and volcanic rocks.

“The hypabyssal rocks were found to have unique mineral compositions due to their complex formation history.”

2. noun

a hypabyssal rock or body.

“The geologist studied the hypabyssal body to understand its formation process.”