noun

1. 1. a roof or roofing of straw, rushes, palm leaves, etc.
   2. material for such a roof
2. any of a number of palms whose leaves are used for thatch
   also thatch palm
3. anything suggestive of thatch on a roof as
   1. the hair growing on the head
   2. a matted layer of partly decayed leaves, stems, etc. between growing vegetation and the soil

Etymology: altered (based on the v.) < older thack < ME thac < OE thæc, a thatch, roof: for base see thatchthe

transitive verb

1. to cover with or as with thatch
2. dethatch

Etymology: ME thecchen < OE thecc(e)an, akin to Ger decken, to cover < IE base *(s)teg-, to cover > Gr stegos, roof, L tegere, to cover