German edit

 
German Wikipedia has an article on:
Wikipedia de

Etymology edit

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

Pronunciation edit

  • (file)

Noun edit

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