thatch

Concise Oxford English Dictionary © 2008 Oxford University Press:
thatch/θatʃ/

▶noun

• 1 a roof covering of straw, reeds, or similar material.

  ■ straw, reeds, etc. used to cover a roof.

• 2 informal the hair on a person's head.

• 3 dead stalks, moss, etc. on a lawn.

▶verb (often as adj. thatched) cover with thatch.

– derivatives
thatcher noun.

– origin OE theccan ‘cover’, of Gmc origin.