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cloud seeding

any technique of adding material to a cloud to alter its natural development, usually to increase or obtain precipitation.
1945-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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cloud-seeding in Science
cloud seeding  
A method of making a cloud give up its moisture as rain, especially by releasing particles of dry ice or silver iodide into cold clouds. Dry ice freezes water droplets in the cloud, turning them into nuclei for the formation of raindrops. Silver iodide particles are used because they have a crystal structure similar to ice and can also serve as nuclei for raindrop formation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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cloud-seeding in Culture

cloud seeding definition

A technique for producing rain by dropping chemicals or small objects into clouds.

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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Encyclopedia Article for cloud-seeding

cloud seeding

deliberate introduction into clouds of various substances that act as condensation nuclei or ice nuclei in an attempt to induce precipitation. The first experiments with cloud seeding were conducted in 1946; since then seeding has been performed from aircraft, rockets, cannons, and ground generators. Many substances have been used, but solid carbon dioxide and silver iodide have been the most effective; when used in supercooled clouds (composed of water droplets at temperatures below freezing), they form nuclei around which the water droplets evaporate. The resulting water vapour deposits into ice crystals, which build quickly as water droplets attach themselves. Attempts have been made to use these substances to minimize damage to crops and buildings from hailstones.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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