Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


noun di·o·rite \ˈdī-ə-ˌrīt\

Definition of diorite

  1. :  a granular crystalline igneous rock commonly of acid plagioclase and hornblende, pyroxene, or biotite


play \ˌdī-ə-ˈri-tik\ adjective

Origin and Etymology of diorite

French, irregular from Greek diorizein to distinguish, from dia- + horizein to define — more at horizon

First Known Use: 1826

Learn More about diorite

Seen and Heard

What made you want to look up diorite? Please tell us where you read or heard it (including the quote, if possible).