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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Thin dry scales or scabs upon the body; especially, thin scales exfoliated from the cuticle, particularly of the scalp; dandruff.

2. Hence, the foul remains of anything adherent. The scurf is worn away of each committed crime. (Dryden)

3. Anything like flakes or scales adhering to a surface. There stood a hill not far, whose grisly top Belched fire and rolling smoke; the rest entire Shone with a glossy scurf. (milton)

4. (Science: botany) minute membranous scales on the surface of some leaves, as in the goosefoot.

Origin: AS. Scurf, sceorf, or from Scand.; cf. Sw. Skorf, Dan. Skurv, Icel. Skurfur, D. Schurft, G. Schorf; all akin to AS. Scurf, and to AS. Sceorfan to scrape, to gnaw, G. Schurfen to scrape, and probably also to E. Scrape. Cf. Scurvy.