Webster's English Dictionary

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thatch

1. thatch \'thach\ vt [ME thecchen, fr. OE theccan to cover; akin to OHG 
   decchen to] cover, L tegere, Gk stegein to cover, stegos roof, Skt sthagati 
   he covers : to cover with or as if with thatch  - thatch.er n
2. thatch n : a plant material (as straw) used as a sheltering cover esp. 
   of a house;  also : a sheltering cover (as a house roof) made of such 
   material