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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A radioactive isotope of cobalt with mass number 60 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy

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