Definitions

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

  • noun A coarse-grained igneous rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene.

from The Century Dictionary.

  • noun A phanerocrystalline rock intermediate in composition between granite and quartz-diorite: nearly the same as quartz-monzonite.

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

  • noun an intrusive igneous rock similar to granite, but containing more plagioclase than potassium feldspar.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

granite +‎ diorite

Examples

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