the earth's magnetic field and associated phenomena
2.
the branch of geophysics that studies such phenomena
Word origin
[1935–40; geo- + magnetism]This word is first recorded in the period 1935–40. Other words that entered Englishat around the same time include: aeroembolism, blitz, fluorocarbon, hard core, walk-throughgeo- is a combining form meaning “the earth,” used in the formation of compound words.Other words that use the affix geo- include: geocentric, geophysics, georama, geostrophic, geosyncline
Examples of 'geomagnetism' in a sentence
geomagnetism
The question remains whether the sense of direction enjoyed by many humans owes something to geomagnetism.