ful·gu·rite /ˈfʊlg(j)əˌraɪt, ˈfʊlʤə, ˈfʌl-/ 電管,電筒,閃電岩
Ful·gu·rite n. A vitrified sand tube produced by the striking of lightning on sand; a lightning tube; also, the portion of rock surface fused by a lightning discharge. ◄ ►