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Noun: paleomagnetism  ,pey-lee-ow'mag-nu-ti-zum
Usage: N. Amer (elsewhere: palaeomagnetism)
  1. Study of the record of the Earth's magnetic field using the magnetization of rocks, sediment, etc.
    "paleomagnetism has been crucial in understanding plate tectonics";
    - palaeomagnetism [Brit, Cdn]

Encyclopedia: Paleomagnetism