thatch 
(th
ăch)
n.1. Plant stalks or foliage, such as reeds or palm fronds, used for roofing.
2. Something, such as a thick growth of hair on the head, that resembles thatch.
3. Dead turf, as on a lawn.
tr.v. thatched,
thatch·ing,
thatch·es To cover with or as if with thatch.
[Middle English thacche, alteration (influenced by thecchen, thacchen, to thatch, from Old English theccan, to cover) of thak, from Old English thæc; see (s)teg- in the Appendix of Indo-European roots.]
thatcher n.
thatchy adj.