/ Dictionary / Index L lossy: Meaning and Definition of Find definitions for: loss•y Pronunciation: (lô'sē, los'ē), [key] — adj. Elect. (of a material or transmission line) causing appreciable loss or dissipation of energy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lossy (Thesaurus) loss ratio lost Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language