hypabyssal

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Solidifying chiefly as a minor intrusion, especially as a dike or sill, before reaching the earth's surface. Used of rocks.

from The Century Dictionary.

• In petrography, a term applied by Brögger (1894) to igneous rocks intermediate in texture between coarse-grained (abyssal) forms and extrusive lava.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective geology that solidifies, as a minor intrusion, before reaching the Earth's surface