Meaning

noun the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field

originEtymology tree Pre-Greekbor.? Ancient Greek Μάγνης (Mágnēs) Ancient Greek μᾰ́γνης (mắgnēs)bor. Old French magnetebor. ▲ Ancient Greek μᾰ́γνης (mắgnēs)bor. Latin magnēsbor. Middle English magnete English magnet English magnet- Ancient Greek -ο- (-o-)der. Latin -o-bor. English -o- English magneto- Ancient Greek σφαῖρᾰ (sphaîră)bor. Latin sphaera Late Latin sphērader. Old French spherebor. Middle…

Etymology from Wiktionary, CC BY-SA 3.0