Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A gneiss derived from an igneous rock.

from The Century Dictionary and Cyclopedia

  • n. In petrography, a name given by Rosenbusch (1898) to gneiss derived from igneous rocks: opposed to paragneiss.

Etymologies

ortho- +‎ gneiss (Wiktionary)

Examples

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