"refraction index" in German refraction index Brechungsindex Detailed translations for "refraction index" refraction index refraction index(also: refractive index) der Brechungsindex{masculine} I thought so too, at first, but its molecular density and refraction index is much higher. Source: opensubtitles.org Corpus by OPUS Request review Das dachte ich am Anfang auch. Aber molekulare Dichte und Brechungsindex sind viel höher.