fulgurite Hear it!

fulgurite definition

ful·gu·rite (ful′gyo̵o rīt′)

noun

a glassy substance, usually tube-shaped, formed by fusion when sand, rock, etc. are struck by lightning

Etymology: L fulgur (see fulgurate) + -ite

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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