Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
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noun
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.
Definition source: English Wiktionary via Wiktextract
Usage: dated
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
Named after the German physicist Philipp Lenard, who first described them.
