Standard Lemma guide

thermionic

adj · 2 senses · updated from the 2026-07-25 local source snapshot

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

Pronunciation

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No pronunciation record was provided for this word.

1

adj

Meaning 1

Involving the emission of electrons from a heated electrode.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adjective

Meaning 2

of or relating to or characteristic of thermions

Definition source: Princeton WordNet 3.0

Examples

  • thermionic cathode

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

No etymology was provided for this word.

Across languages

Translations

5 source translations are retained for this English entry.

  • French: thermoïonique — concerning the emission of electrons from a heated electrode
  • Italian: termoionico — concerning the emission of electrons from a heated electrode
  • Portuguese: termiónico — concerning the emission of electrons from a heated electrode
  • Portuguese: termiônico — concerning the emission of electrons from a heated electrode
  • Spanish: termoiónico — concerning the emission of electrons from a heated electrode