A thin flake or scale of dead skin, especially one that forms on the scalp. He noticed some scurf on his shoulders after brushing his hair.
A scaly or scabby condition of a plant, often caused by a fungus or parasite. The gardener was concerned about the scurf affecting the leaves of the rose bushes.
A thin film or layer of scale, rust, or dirt that forms on the surface of metal or another material. The blacksmith brushed the scurf from the blade before quenching it.