WordNet (3.0) WordNet (3.0)
(n) a scientific instrument that registers magnetic variations (especially variations of the earth's magnetic field)
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. [ Magneto- + -graph. ] (Physics) An automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements. [ 1913 Webster ]
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