/ Dictionary / Index L loess: Meaning and Definition of Find definitions for: lo•ess Pronunciation: (lō'es, les, lus), [key] — n. a loamy deposit formed by wind, usually yellowish and calcareous, common in the Mississippi Valley and in Europe and Asia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: loess (Thesaurus) loellingite Loesser 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