a windstorm, especially in a desert, that blows along great clouds of sand (distinguished from dust storm ).

1765–75; sand + storm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sandstorm (ˈsændˌstɔːm)
a strong wind that whips up clouds of sand, esp in a desert

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sandstorm   (sānd'stôrm')  Pronunciation Key 
A strong wind that carries clouds of sand and dust through the air. Most of the particles in a sandstorm are between 0.08 and 1 mm (0.0032 and 0.04 inches) in size. Sandstorms usually are limited to within 3 m (10 ft) of the ground, rarely getting more than 15 m (49 ft) high. They develop in desert areas where loose sand can be stirred up by wind. Most sandstorms occur during the day when the Earth's surface heats up and dissipate at night as it cools.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sadly, these little dinosaurs were buried alive, probably by a sandstorm.
Each sample was exposed to the lab-generated sandstorm for five minutes and
  then weighed to find out how badly it had been eroded.
Through the window, the darkening sky geared up for another sandstorm.
He called every other day, the sound of artillery or of a raging sandstorm in
  the background.
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