from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The International System unit of radioactivity, equal to one nuclear decay or other nuclear transformation per second.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In the International System of Units, the derived unit of radioactive activity; the activity of a quantity of radioactive material in which one nucleus decays per second. Symbol: Bq
After Antoine Henri Becquerel.(American Heritage® Dictionary of the English Language, Fourth Edition)
Borrowing from French becquerel. Named after the French physicist Henri Becquerel. (Wiktionary)