Definitions of thatch:

noun: a house roof made with a plant material (as straw)
noun: hair resembling thatched roofing material
noun: plant stalks used as roofing material
noun: an English pirate who operated in the Caribbean and off the Atlantic coast of North America (died in 1718)
verb: cover with thatch
Example: "Thatch the roofs"
name: A surname (very rare: popularity rank in the U.S.: #19925)