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.

1645–55; thunder + storm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thunderstorm (ˈθʌndəˌstɔːm)
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 10th Edition
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American Heritage
Science Dictionary
thunderstorm   (thŭn'dər-stôrm')  Pronunciation Key 
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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Example sentences
As the name implies, there is usually only one cell with this type of
But for a thunderstorm that must have seemed heaven-sent, many of the city's
  public buildings might have burned to the ground.
One is why the plane ended up inside the thunderstorm.
All that was left were these neon-lit bikes riding down the street in a
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