/ Dictionary / Index L landmass: Meaning and Definition of Find definitions for: land•mass Pronunciation: (land'mas"), [key] — n. Geol. a part of the continental crust above sea level having a distinct identity, as a continent or large island. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: landmass (Thesaurus) landmark land measure 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