/ Dictionary / Index S samarium: Meaning and Definition of Find definitions for: sa•mar•i•um Pronunciation: (su-mâr'ē-um), [key] — n. Chem. a rare-earth metallic element discovered in samarskite. Symbol: Sm; at. wt.: 150.35; at. no.: 62; sp. gr.: 7.49. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: samarium (Thesaurus) Samaritan Samarkand Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language