from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The emission of light by a charged particle passing through a transparent nonconducting liquid or solid material at a speed greater than the speed of light in that material.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The emission of light (Cerenkov radiation) that occurs when a charged particle passes through an insulator at a speed greater than the speed of light in that medium; the characteristic blue glow from a nuclear reactor.
After Pavel Alekseevich Cherenkov.(American Heritage® Dictionary of the English Language, Fourth Edition)