/ θætʃ; NAmE / noun , verb
■ noun
1.
[ U , C ] dried straw , reeds , etc. used for making a roof; a roof made of this material :
a roof made of thatch
The thatch was badly damaged in the storm.
2.
[ sing. ] thatch of hair ( informal ) thick hair on sb's head
■ verb
[ vn ] to cover the roof of a building with thatch
► thatched adjective :
They live in a thatched cottage.
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WORD ORIGIN
Old English theccan cover , of Germanic origin; related to Dutch dekken and German decken .