Where does “duotone” come from?

duotone (English) comes from English tone, from Middle English tone, from Latin tonus, from Ancient Greek τόνος, from Proto-Hellenic tónos, from Proto-Indo-European tónos, from Proto-Indo-European ten- — to stretch, to extend.

duotone (English): Any picture printed in two shades of the same...

Definitions

  1. Any picture printed in two shades of the same...

Ancestry of “duotone”, step by step

duotone traces back through two separate lines of ancestry.

via English tone

StepLanguageWordMeaning
1EnglishtoneA specific pitch; An interval of a major second;...
2Middle Englishtonethe one
3LatintonusThe stretching or straining of a rope; A strain;...
4Ancient Greekτόνοςrope, cord; chord; tone, note
5Proto-Hellenictónosrope, cord; tension
6Proto-Indo-Europeantónossomething stretched; chord, fiber, string
7Proto-Indo-Europeanten-to stretch, to extend

via English duo

StepLanguageWordMeaning
1EnglishduoTwo people who work or collaborate together as...
2Frenchduoduo; duet
3ItalianduoObsolete form of due; duo; duet
4Latinduōtwo; 2
5Proto-Italicduōtwo
6Proto-Indo-Europeandwóh₁two
Every word from Proto-Indo-European ten-