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