/ Dictionary / Index L lutecium: Meaning and Definition of Find definitions for: lu•te•ci•um Pronunciation: (l-tē'shē-um), [key] — n. Chem. lutetium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lutecium (Thesaurus) luteal phase lutefisk Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language