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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