thatch /θæt͡ʃ/noun 4verb 1forms 4 noun4 •Straw, rushes, or similar, used for making or covering the roofs of buildings, or of stacks of hay or grain.Just over halfway up, we reached the Human settlement with its houses of stone and wood and thatch. This was a prewar place. — 1989 •(figurative) Any strawlike material, such as a person's hair.An outgoing, story-telling Irishman from Butte, Montana, with his thatch of red hair and sandpapered face, Matt was the quintessential imp. — 2008 •A buildup of cut grass, stolons or other material on the soil in a lawn. •(Caribbean) Any of several kinds of palm, the leaves of which are used for thatching. verb1 •To cover the roof with straw, reed, leaves, etc. formsthatched · thatcht · thatching · thatches