/ Dictionary / Index L lipofuscin: Meaning and Definition of Find definitions for: lip•o•fus•cin Pronunciation: (lip"u-fus'in, lī"pu-), [key] — n. Biochem. any of several brown pigments similar to melanin that accumulate in animal cells with age and are products of oxidation of lipids and lipoproteins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lipofilling lipogram Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language