/ Dictionary / Index S syenite: Meaning and Definition of Find definitions for: sy•e•nite Pronunciation: (sī'u-nīt"), [key] — n. 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. Syene syke Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language