Cherenkov radiation

noun Physics.
radiation produced by a particle passing through a medium at a speed greater than that of light through the medium.
Also, Cerenkov radiation.

1935–40; named after P. A. Cherenkov

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World English Dictionary
Cherenkov radiation (tʃɪˈrɛŋkɒf)
the electromagnetic radiation produced when a charged particle moves through a medium at a greater velocity than the velocity of light in that medium
[C20: named after Pavel Alekseyevich Cherenkov (1904--90), Soviet physicist]

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American Heritage
Science Dictionary
Cherenkov radiation  
Variant of Cerenkov radiation.
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