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Variant of Cherenkov radiation.
Ce•ren′kov radia`tion(tʃəˈrɛŋ kɔf, -kɒf, -ˈrɛn-)
radiation produced by a particle passing through a medium at a speed greater than that of light through the medium.
[1935–40; after P. A. Cerenkov (born 1904), Russian physicist]