Dioptrie

== German == === Pronunciation === === Noun === Dioptrie f (genitive Dioptrie, plural Dioptrien) diopter ==== Usage notes ==== Due to the rarity of the singular form, and by influence of the suffix -in n sg, the plural Dioptrien may be reanalyzed as a mass noun in the vernacular. This usage is nonstandard. ==== Declension ==== === Further reading === “Dioptrie”, in Digitales Wörterbuch der deutschen Sprache‎[1] (in German) “Dioptrie” in Duden online