/ Dictionary / Index F fermium: Meaning and Definition of Find definitions for: fer•mi•um Pronunciation: (fûr'mē-um), [key] — n. Chem., Physics. a transuranic element. Symbol: Fm; at. no.: 100. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fermium (Thesaurus) fermion fern Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language