Phrase guide

third rail

noun · 3 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

noun

Meaning 1

The electrified rail that runs beside or between train tracks to power electric trains.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Anything that is controversial or dangerous to come into contact with, or is best avoided.

Definition source: English Wiktionary via Wiktextract

Usage: broadly

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

a rail through which electric current is supplied to an electric locomotive

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: track, rail, rails, runway

History

Etymology

No etymology was provided for this word.

Across languages

Translations

14 source translations are retained for this English entry.

  • Catalan: tercer carril — the electrified rail that runs beside or between train tracks to power electric trains
  • Dutch: derde rail — the electrified rail that runs beside or between train tracks to power electric trains
  • Finnish: virtakisko — the electrified rail that runs beside or between train tracks to power electric trains
  • French: troisième rail — the electrified rail that runs beside or between train tracks to power electric trains
  • German: Stromschiene — the electrified rail that runs beside or between train tracks to power electric trains
  • Italian: rotaia elettrificata — the electrified rail that runs beside or between train tracks to power electric trains
  • Norwegian Bokmål: strømskinne — the electrified rail that runs beside or between train tracks to power electric trains
  • Norwegian Nynorsk: straumskinne — the electrified rail that runs beside or between train tracks to power electric trains
  • Norwegian Nynorsk: strømskinne — the electrified rail that runs beside or between train tracks to power electric trains
  • Polish: trzecia syna — the electrified rail that runs beside or between train tracks to power electric trains
  • Portuguese: terceiro carril — the electrified rail that runs beside or between train tracks to power electric trains
  • Portuguese: terceiro trilho — the electrified rail that runs beside or between train tracks to power electric trains
  • Spanish: tercer riel — the electrified rail that runs beside or between train tracks to power electric trains
  • Spanish: riel electrificado — the electrified rail that runs beside or between train tracks to power electric trains