Phrase guide

refractive index

noun · 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

noun

Meaning 1

The ratio of the speed of light in air or vacuum to that in another medium.

Definition source: English Wiktionary via Wiktextract

Topics: natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

the ratio of the velocity of light in a vacuum to that in a medium

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: index of refraction

Antonyms: none provided

Broader terms: ratio

History

Etymology

No etymology was provided for this word.

Across languages

Translations

21 source translations are retained for this English entry.

  • Chinese: 折射率 (zhéshèlǜ) — ratio of the speed of light in vacuum to another medium
  • Danish: brydningsindeks — ratio of the speed of light in vacuum to another medium
  • Dutch: brekingsindex — ratio of the speed of light in vacuum to another medium
  • Finnish: taitekerroin — ratio of the speed of light in vacuum to another medium
  • French: indice de réfraction — ratio of the speed of light in vacuum to another medium
  • Georgian: გარდატეხის მაჩვენებელი (gardaṭexis mačvenebeli) — ratio of the speed of light in vacuum to another medium
  • German: Brechzahl — ratio of the speed of light in vacuum to another medium
  • German: Brechungsindex — ratio of the speed of light in vacuum to another medium
  • Indonesian: indeks bias — ratio of the speed of light in vacuum to another medium
  • Indonesian: indeks refraksi — ratio of the speed of light in vacuum to another medium
  • Japanese: 屈折率 (kussetsuritsu) — ratio of the speed of light in vacuum to another medium
  • Māori: taupū hakoko — ratio of the speed of light in vacuum to another medium
  • Polish: współczynnik załamania — ratio of the speed of light in vacuum to another medium
  • Romanian: indice de refracție — ratio of the speed of light in vacuum to another medium
  • Scottish Gaelic: ìre de sholas-bhriseadh — ratio of the speed of light in vacuum to another medium
  • Serbo-Croatian: indeks prelamanja — ratio of the speed of light in vacuum to another medium
  • Serbo-Croatian: индекс преламања — ratio of the speed of light in vacuum to another medium
  • Spanish: índice de refracción — ratio of the speed of light in vacuum to another medium
  • Swedish: brytningsindex — ratio of the speed of light in vacuum to another medium
  • Telugu: వక్రీభవన గుణకము (vakrībhavana guṇakamu) — ratio of the speed of light in vacuum to another medium
  • Vietnamese: chiết suất — ratio of the speed of light in vacuum to another medium