Lenard rays

plural noun

Le·​nard rays

ˈlāˌnärt-,

ləˈnärd-

: a mixture of cathode rays that have emerged from a vacuum tube into the outside space through a window consisting of a piece of thin metal foil and rays emitted by the foil as a result of the incidence of the cathode rays

Word History

Etymology

after Philipp Lenard †1947 German physicist

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