scurf

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Scaly or shredded dry skin, such as dandruff.
2. n. A loose scaly crust coating a surface, especially of a plant.

Century Dictionary and Cyclopedia

1. n. Scaly or flaky matter on the surface of the skin; the scarf-skin or epidermis exfoliated in fine shreds or scales. Scurf is continually coming from the human skin, being removed by the friction of the clothes, in the bath, etc. The scurf of the head, where it may remain held by the hair in considerable quantity, is known as dandruff. In some diseases affecting the skin, scurf comes off in large flakes or layers, as in the desquamation or “peeling” after scarlet fever.
2. n. Any scaly or flaky matter on a surface.
3. n. Specifically.
4. n. In botany, a loose bran-like scaly matter that is found on some leaves, as in the genus Elæagnus, etc.
5. n. A growth of polyps on oysters.
6. n. Scum; offscouring.
7. n. A gray bulltrout; a variety of the trout, Salmo trutta cambricus.
8. n. A fungous disease of potatoes, due to Rhizoctonia Solani, which gives the tubers a scurfy appearance and is accompanied by decay.

Wiktionary

1. n. A skin disease.
2. n. The flakes of skin that fall off as a result of a skin disease.
3. n. Any crust-like formations on the skin, or in general.
4. n. figuratively The foul remains of anything adherent.
5. n. botany Minute membranous scales on the surface of some leaves, as in the goosefoot.

GNU Webster's 1913

1. n. Thin dry scales or scabs upon the body; especially, thin scales exfoliated from the cuticle, particularly of the scalp; dandruff.
2. n. Hence, the foul remains of anything adherent.
3. n. Anything like flakes or scales adhering to a surface.
4. n. (Bot.) Minute membranous scales on the surface of some leaves, as in the goosefoot.

WordNet 3.0

1. n. a thin flake of dead epidermis shed from the surface of the skin
2. n. (botany) a covering that resembles scales or bran that covers some plant parts