geomagnetism

[jee-oh-mag-ni-tiz-uhm]
noun
1.
the earth's magnetic field and associated phenomena.
2.
the branch of geophysics that studies such phenomena.

Origin:
1935–40; geo- + magnetism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
geomagnetism (ˌdʒiːəʊˈmæɡnɪˌtɪzəm)
 
n
1.  the magnetic field of the earth
2.  the branch of physics concerned with this
 
geomagnetic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
geomagnetism   (jē'ō-māg'nĭ-tĭz'əm)  Pronunciation Key 
  1. The magnetic properties of the Earth and its atmosphere.

  2. The study of these properties.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The study of geomagnetism is one of the oldest of the geophysical sciences.
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