/ Dictionary / Index G gluonium: Meaning and Definition of Find definitions for: glu•o•ni•um Pronunciation: (gl-ō'nē-um), [key] — pl. -ni•ums, -ni•a glueball. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gluon gluside Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language