A unit of radioactivity equal to the amount of a radioactive isotope that decays at the rate of 37,000,000,000 disintegrations per second WordNet 3.0 & Open English WordNet

The curie is a non-SI unit of radioactivity originally defined in 1910. Wikipedia

Unit of radioactivity Wikipedia Disambiguation

Non-SI unit of radioactivity Wikidata

A unit of radioactivity equal to one millionth of a curie. OmegaWiki

The original unit used to describe the intensity of radioactivity in a sample of material. One curie equals thirty-seven billion disintegrations per second, or approximately the radioactivity of one gram of radium. This unit is no longer recognized as part of the International System of units. It has been replaced by the becquerel. OmegaWiki

3.7×1010 decays per second, as a unit of radioactivity. Symbol Ci. Wiktionary