syenite: Meaning and Definition of

sy•e•nite

Pronunciation: (sī'u-nīt"), [key]
— n.
  1. a granular igneous rock consisting chiefly of orthoclase and oligoclase with hornblende, biotite, or augite.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.