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 epigene.

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

  • adjective geology Formed underground, (often by ascending solutions).


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  • One of the dictionaries cited here defines 'hypogene' as 'netherformed', a word with no entry at all, not even from that dictionary. I wonder if the other 24 people who looked it up before me were led to it by the same curiosity.

    June 16, 2015