/ Dictionary / Index L lawrencium: Meaning and Definition of Find definitions for: law•ren•ci•um Pronunciation: (lô-ren'sē-um), [key] — n. Chem. a synthetic, radioactive, metallic element. Symbol: Lr; at. no.: 103. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lawrencium (Thesaurus) Lawrence frame Lawrentian Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language