touch·wood 
(tŭchwd′)
(tŭchwd′)n.
Material, such as decayed wood, that is used as tinder; punk.
[From its being easy to ignite.]
- sacred cow
- sacred ibis
- sacredly
- sacredness
- sacrifice
- sacrifice bunt
- sacrifice fly
- sacrificer
- sacrificial
- sacrificial anode
- sacrificially
- sacrilege
- sacrilegious
- sacrilegiously
- sacrilegiousness
- sacrilegist
- sacristan
- sacristy
- sacro-
- sacrococcygeal
- sacroiliac
- sacrolumbar
- sacrosanct
- sacrosanctity
- sacrosciatic