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The following 2 entries include the term astatic.
astatic galvanometer
noun: a galvanometer having two needles with opposite polarities that reduce the effect of the earth's magnetism
astatic pair
noun: two small coplanar magnets of equal moment rigidly attached at right angles to a stiff wire with their moments oppositely directed and forming a system that experiences no directive influence when suspended in a uniform magnetic field
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Merriam-Webster unabridged
