CERNCERN /sɜːn $ sɜːrn/ 
(Centre Européen de Recherche Nucléaire (=European Nuclear Research Centre)) a large scientific organization based in Geneva, Switzerland, that studies particle physics. It operates the world's largest particle physics laboratory. Its members are from 20 European countries, and it is famous for building very large and powerful particle accelerators (=special machines for making very small pieces of matter move at very high speeds). Its new accelerator, the Large Haydron Collider (LHC), is the most powerful in the world.
(Centre Européen de Recherche Nucléaire (=European Nuclear Research Centre)) a large scientific organization based in Geneva, Switzerland, that studies particle physics. It operates the world's largest particle physics laboratory. Its members are from 20 European countries, and it is famous for building very large and powerful particle accelerators (=special machines for making very small pieces of matter move at very high speeds). Its new accelerator, the Large Haydron Collider (LHC), is the most powerful in the world.