411 REFERENCE · Wiktionary
Lenard ray
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after the German physicist Philipp Lenard, who first described them.
Noun
en dated One of the rays that emanate from the outer surface of a plate composed of any material permeable by cathode rays, such as aluminium, which forms a portion of a wall of a vacuum tube, or which is mounted within the tube and exposed to radiation from the cathode.
Related terms
en Lenard tube
en eponyms