/ Dictionary / Index L lanthanide: Meaning and Definition of Find definitions for: lan•tha•nide Pronunciation: (lan'thu-nīd", -nid), [key] — n. Chem. any element of the lanthanide series. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lanthanide (Thesaurus) lantern wheel lanthanide series Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language