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ball lightning

noun
1.
a rare form of lightning, consisting of a bright, luminous ball that moves rapidly along objects or floats in the air.
Also called globe lightning.
Origin of ball lightning
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ball lightning
  • People have reported seeing ball lightning-a rare phenomenon that resembles a glowing sphere of electricity-for hundreds of years.
  • Magnetohydrodynamic equilibrium of plasma ball lightning.
British Dictionary definitions for ball lightning

ball lightning

noun
1.
(meteorol) a luminous electrically charged ball occasionally seen during electrical storms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ball lightning in Science
ball lightning  
A rare form of lightning in the shape of a glowing red ball, associated with thunderstorms and sometimes accompanied by a loud noise. Ball lightning is thought to consist of ionized gas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Difficulty index for ball lightning

Few English speakers likely know this word

Word Value for ball

6
9
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