dioptrie
French, noun\djɔp.tʁi\
dioptrie is spelled D-I-O-P-T-R-I-E (8 letters) and appears about once in every 33 million words in written French, the 184,024th most frequent French word form (wordfreq, 2021 data). Dioptrie is a French feminine noun meaning “diopter” (English Wiktionary, September 2026). The French Wiktionary (Wiktionnaire) defines it as “Unité de convergence des lentilles ou autres systèmes optiques dont le symbole est δ, et se mesure en m⁻¹”.
What does dioptrie mean in English?
noun
- 1
femininediopter
Source: English Wiktionary, French section, dump of September 2, 2026 (CC BY-SA 4.0).
How French dictionaries define it
noun: 1. Unité de convergence des lentilles ou autres systèmes optiques dont le symbole est δ, et se mesure en m⁻¹.
The definition in the French Wiktionary (Wiktionnaire), in French.
Source: French Wiktionary (Wiktionnaire), dump of September 1, 2026 (CC BY-SA 4.0), through kaikki.org.
Forms of dioptrie
- dioptries plural
- dyoptrie
Source: English Wiktionary and French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026).
How do you pronounce dioptrie?
- \djɔp.tʁi\
Sources: English Wiktionary, French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026); recordings from Wikimedia Commons.
How common is dioptrie in French?
dioptrie appears about once in every 33 million words in written French.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).