scurf

1. A skin disease.
2. The flakes of skin that fall off as a result of a skin disease.

   Synonyms: dandruff

3. Any crust-like formations on the skin, or in general.
   • 1667, John Milton, “Book I ↗”, in Paradise Lost. A Poem Written in Ten Books, London: Printed [by Samuel Simmons], and are to be sold by Peter Parker […] [a]nd by Robert Boulter […] [a]nd Matthias Walker, […], OCLC 228722708 ↗; republished as Paradise Lost in Ten Books: The Text Exactly Reproduced from the First Edition of 1667: […], London: Basil Montagu Pickering […], 1873, OCLC 230729554 ↗, lines 670–673:

     There ſtood a Hill not far whoſe frieſly top / Belch'd fire and rowling ſmoak; the reſt entire / Shon with a gloſſie ſcurff, undoubted ſign / That in his womb was hid metallic Ore,

4. (figurative) The foul remains of anything adherent.

   Synonyms: scum

   • 1697, “The Sixth Book of the Æneis”, in John Dryden, transl., The Works of Virgil: Containing His Pastorals, Georgics, and Æneis. […], London: Printed for Jacob Tonson, […], OCLC 403869432 ↗, line 1011, page 392 ↗:

     The Scurf is worn away, of each committed Crime

5. (botany) Minute membranous scales on the surface of some leaves, as in the goosefoot.

• Italian: crosta

scurf (plural scurfs)

1. A grey bull trout (Salvelinus confluentus).