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A diamagnetic substance.
(General Physics) a substance exhibiting diamagnetism
di•a•mag•net(ˈdaɪ əˌmæg nɪt)
a substance, as bismuth or copper, whose permeability is less than that of a vacuum: in a magnetic field, its induced magnetism is in a direction opposite to that of iron.
di`a•mag•net′ic (-ˈnɛt ɪk) adj.