Producing or occurring under the surface of the earth.
- ‘As fluids moved out from the intrusions, hypogene mineralization progressed in four stages.’
- ‘He concluded that the pearceite was probably hypogene and did not result from secondary, supergene enrichment.’
- ‘It has been somewhat tentatively identified as a primary hypogene mineral in several deposits.’
Mid 19th century: from hypo- under + Greek genēs -born, of a certain kind.