/ Dictionary / Index U unnilhexium: Meaning and Definition of Find definitions for: un•nil•hex•i•um Pronunciation: (y"nil-hek'sē-um), [key] — n. provisional name for the transuranic element with atomic number 106. Symbol: Unh&hasp; Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unnerve unnilpentium Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language