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Etymology

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From Brechung (refraction) +‎ -s- +‎ Index (index).

Pronunciation

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Noun

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Brechungsindex m (strong, genitive Brechungsindexes or Brechungsindex, plural Brechungsindizes or Brechungsindices)

  1. (physics) refractive index
    Synonym: Brechzahl
    Der Brechungsindex von Luft ist fast eins.
    The refractive index of air is almost one