Thatch

noun

1. Straw, rushes, or similar, used for making or covering the roofs of buildings, or of stacks of hay or grain.
2. Any of several kinds of palm, the leaves of which are used for thatching.
3. A buildup of cut grass, stolons or other material on the soil in a lawn.
4. (by extension) Any straw-like material, such as a person's hair.