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thunderstorm

[thuhn-der-stawrm] /ˈθʌn dərˌstɔrm/
noun
1.
a transient storm of lightning and thunder, usually with rain and gusty winds, sometimes with hail or snow, produced by cumulonimbus clouds.
Also called electrical storm.
Origin
1645-1655
1645-55; thunder + storm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thunder storm

thunderstorm

/ˈθʌndəˌstɔːm/
noun
1.
a storm caused by strong rising air currents and characterized by thunder and lightning and usually heavy rain or hail
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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Word Origin and History for thunder storm

thunderstorm

n.

1650s, from thunder (n.) + storm (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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thunder storm in Science
thunderstorm
  (thŭn'dər-stôrm')   
A storm of heavy rain accompanied by lightning, thunder, wind, and sometimes hail. Thunderstorms occur when moist air near the ground becomes heated, especially in the summer, and rises, forming cumulonimbus clouds that produce precipitation. Electrical charges accumulate at the bases of the clouds until lightning is discharged. Air in the path of the lightning expands as a result of being heated, causing thunder. Thunderstorms can also be caused by temperature changes triggered by volcanic eruptions and forest fires, and they occur with much greater frequency at the equatorial regions than in polar regions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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