dioptre
French, noun\djɔptʁ\
dioptre is spelled D-I-O-P-T-R-E (7 letters) and appears about once in every 26 million words in written French, the 164,661st most frequent French word form (wordfreq, 2021 data). Dioptre is a French masculine noun meaning “diopter” (English Wiktionary, September 2026). The French Wiktionary (Wiktionnaire) defines it as “Surface séparant deux milieux transparents ayant chacun un indice de réfraction différent”.
What does dioptre mean in English?
noun
- 1
masculinediopter
Source: English Wiktionary, French section, dump of September 2, 2026 (CC BY-SA 4.0).
How French dictionaries define it
noun: 1. Surface séparant deux milieux transparents ayant chacun un indice de réfraction différent.
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 dioptre
- dioptres plural
Source: English Wiktionary and French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026).
How do you pronounce dioptre?
- \djɔptʁ\
Sources: English Wiktionary, French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026); recordings from Wikimedia Commons.
How common is dioptre in French?
dioptre appears about once in every 26 million words in written French.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).