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lipofuscin
lipofuscin n. 
/ˌlʌɪpə(ʊ)ˈfʌsɪn/, /ˌlaɪpəˈfəsən/, /ˌlɪpoʊˈfjusən/, /ˌlaɪpoʊˈfjusən/ [fuscin n.] any of various brownish pigments of animals, esp. those characteristically deposited in the cells during old age.
Brit. /ˌlɪpə(ʊ)ˈfʌsɪn/
, /ˌlɪpə(ʊ)ˈfʌsɪn//ˌlʌɪpə(ʊ)ˈfʌsɪn/U.S. /ˌlɪpəˈfəsən/
, /ˌlɪpəˈfəsən//ˌlaɪpəˈfəsən//ˌlɪpoʊˈfjusən//ˌlaɪpoʊˈfjusən/ΘΚΠ
the world > life > biology > substance > pigment > [noun] > human or animal pigments > brown
urobilin1876
lipofuscin1923
1923 Chem. Abstr. 17 1667 Lipofuscin is not limited to ectodermal cells, although it is found there chiefly.
1928 Amer. Jrnl. Pathol. 4 293 The pigment present in these last organs..is a yellow to brown granular substance which is frequently tinged with fat stains, and therefore has been called lipochrome in this country, and lipofuscin in Germany. These two names are used to designate the substance in most English and American literature, but they actually represent different pigments.
1964 Oceanogr. & Marine Biol. 2 408 Another brown pigment [in the echinoderm Diadema] appears to be a lipofuscin.
1968 R. Passmore & J. S. Robson Compan. Med. Stud. I. xiii. 16/1 Lipofuscin, one of the commonest cellular pigments, is known by a variety of names (wear and tear pigment, haemofuscin, lipochrome, brown atrophy and age pigment), a selection which demonstrates its complexity as well as ignorance of its function, and indicates that it contains some lipid and some iron.
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