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californium

noun

cal·​i·​for·​ni·​um ˌka-lə-ˈfȯr-nē-əm How to pronounce californium (audio)
: a radioactive chemical element with atomic number 98 that is produced artificially from the decay of berkelium and that is used chiefly as a neutron source in radiography and to start nuclear reactors see Chemical Elements Table

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