/ Dictionary / Index N nobelium: Meaning and Definition of Find definitions for: no•bel•i•um Pronunciation: (nō-bel'ē-um, -bē'lē-), [key] — n. Chem., Physics. a transuranic element in the actinium series. Symbol: No; at. no.: 102. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nobelium (Thesaurus) Nobelist Nobel prize Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language