Wiktionary
n. (context biochemistry English) Any of a family of pigmented lipid granules that accumulates in several body tissues
Wikipedia
thumb|right|upright=1.4| Micrograph showing lipofuscin, in brown/yellow, in a liver biopsy with ground glass hepatocytes; H&E stain Lipofuscin is the name given to finely granular yellow-brown pigment granules composed of lipid-containing residues of lysosomal digestion. It is considered to be one of the aging or "wear-and-tear" pigments, found in the liver, kidney, heart muscle, retina, adrenals, nerve cells, and ganglion cells. It is specifically arranged around the nucleus, and is a type of lipochrome.
Usage examples of "lipofuscin".
Superoxide free radicals, which is what these garbage molecules are called, combine with fatty acids to produce lipofuscin, which is an unstable, repulsive gunk that clogs up a cell like grease clogs a drain.