- a unit of activity of radioactive substances equivalent to 3.70 × 1010 disintegrations per second: it is approximately the amount of activity produced by 1 gram of radium-226. Abbreviation: Ci
- Joliot-Curie, Irène.
- Polish physicist and chemist in France: codiscoverer of radium 1898; Nobel Prize in Physics 1903, for chemistry 1911.
- French physicist and chemist: codiscoverer of radium; Nobel Prize in Physics 1903.
- a unit of radioactivity that is equal to 3.7 × 10 10 disintegrations per second
- Marie (mari). 1867–1934, French physicist and chemist, born in Poland: discovered with her husband Pierre the radioactivity of thorium, and discovered and isolated radium and polonium. She shared a Nobel prize for physics (1903) with her husband and Henri Becquerel, and was awarded a Nobel prize for chemistry (1911)
- her husband, Pierre (pjɛr). 1859–1906, French physicist and chemist