from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of radioactivity, equal to the amount of a radioactive isotope that decays at the rate of 3.7 × 1010 disintegrations per second.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 3.7×1010 decays per second, as a unit of radioactivity. Symbol Ci.
After Pierre Curie.(American Heritage® Dictionary of the English Language, Fourth Edition)
Borrowing from French curie. Named after French physicist Pierre Curie (1859 - 1906). (Wiktionary)