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Webster 1913 Edition
Fulgurite
Ful′gu-rite
,Noun.
[L.
fulguritus
, p. p. of fulgurire
to strike with lightning, fr. fulgur
lightning: cf. F. fulgurite
.] 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.