from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Formed or situated below the earth's surface. Used of rocks.
from The Century Dictionary.
- Produced or formed under or below (the earth's surface); netherformed; specifically, in geology, said of rocks which have assumed their present form and structure beneath the surface; Plutonic: a term applied more especially to the granitic rocks: opposed to epigene.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Geol.) Formed or crystallized at depths beneath the earth's surface; -- said of granite, gneiss, and other rocks, whose crystallization is believed of have taken place beneath a great thickness of overlying rocks. Opposed to
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geology Formed underground, (often by ascending solutions).
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