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noun, Physics, Chemistry.
a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced.
(physics) a series of nuclides each of which undergoes radioactive decay into the next member of the series, ending with a stable element, usually lead See uranium series, neptunium series, thorium series, actinium series


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