scurf

Short definition from Wiktionary

Noun

1. 1
   A skin disease.
2. 2
   The flakes of skin that fall off as a result of a skin disease.
3. 3
   Any crust-like formations on the skin, or in general.
4. 4
   The foul remains of anything adherent.
5. 5
   Minute membranous scales on the surface of some leaves, as in the goosefoot.
6. 6
   A low, mean person.
7. 7
   A grey bull trout (Salvelinus confluentus).