thatch

Short definition from Wiktionary

Noun

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

Verb

1. 1
   To cover the roof with straw, reed, leaves, etc.

Proper noun

1. 1
   A surname.