/ Dictionary / Index H hahnium: Meaning and Definition of Find definitions for: hahn•i•um Pronunciation: (hä'nē-um), [key] — n. Chem. unnilpentium. Symbol: Ha Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hahnium (Thesaurus) Hahnemann Haida Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language