Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A unit expressing the rate of decay of radioactive material, equal to one million disintegrations per second, or one million becquerels.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An obsolete unit of radioactivity (symbol: rd), defined as the activity of a quantity of radioactive material in which one million nuclei decay per second.

Etymologies

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

[After Ernest Rutherford.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

After Ernest Rutherford.

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