of, pertaining to, or accompanied by thunder.
producing a noise or effect like thunder.
very great; extraordinary: a thundering amount of work.

before 1100; Middle English thundring, Old English thunring thunder. See thunder, -ing2, -ing1

thunderingly, adverb
unthundering, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thundering (ˈθʌndərɪŋ)
slang (prenominal) very great or excessive: a thundering idiot

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. þunor, from P.Gmc. *thunraz (cf. O.N. þorr, O.Fris. thuner, M.Du. donre, Du. donder, O.H.G. donar, Ger. Donner "thunder"), from PIE *(s)tene- "to resound, thunder" (cf. Skt. tanayitnuh "thundering," Pers. tundar "thunder," L. tonare "to thunder"). Swed. tordön is lit. "Thor's din."
The intrusive -d- is also found in Du. and Icelandic versions of the word. The verb is O.E. þunrian; fig. sense of "to speak loudly, threateningly, bombastically" is recorded from c.1340. Thunderbolt is from c.1440; thunderclap is from c.1386; thunderstruck is from 1613, originally fig.; the lit. sense always has been rare. Thunderhead "high-piled cloud" is recorded from 1861.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
thunder   (thŭn'dər)  Pronunciation Key 
The explosive noise that accompanies a stroke of lightning. Thunder is a series of sound waves produced by the rapid expansion of the air through which the lightning passes. Sound travels about 1 km in 3 seconds (about 1 mi in 5 seconds). The distance between an observer and a lightning flash can be calculated by counting the number of seconds between the flash and the thunder. See Note at lightning.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

thunder definition

The noise created when air rushes back into a region from which it has been expelled by the passage of lightning.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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