Where does “blue-green” come from?

blue-green (English) comes from English Blue, from Middle English blēwe, from Anglo-Norman blew, from Middle French bleu, from Old French blöe, from Latvian blāvus, from Old High German blāo, from Proto-West Germanic blāu — yellow, blond, grey.

blue-green (English): Of a color between blue and green; darker shades...

Definitions

  1. Of a color between blue and green; darker shades...

Ancestry of “blue-green”, step by step

blue-green traces back through two separate lines of ancestry.

via English Blue

StepLanguageWordMeaning
1EnglishBlueA letterman at Oxford or Cambridge; A member of...
2Middle Englishblēwe
3Anglo-Normanblewblue
4Middle Frenchbleublue
5Old Frenchblöeblue
6Latvianblāvusaccusative plural masculine form of blāvs
7Old High Germanblāoblue, dark, grey; blue; yellow
8Proto-West Germanicblāublue
9Proto-Germanicblēwazblue; a dark bluish or grey colour, black
10Proto-Indo-Europeanbʰlēw-yellow, blond, grey

via English Green

StepLanguageWordMeaning
1EnglishGreenOf, or pertaining, to a Green Party or green...
2Middle Englishgrenegreen
3Old Englishgrēnegreen
4Proto-West Germanicgrōnīgreen
5Proto-Germanicgrōnizgreen
6Proto-Indo-Europeanǵʰreh₁-to become green, grow; to grow; to green, to grow

Words derived from “blue-green

Every word from Proto-Indo-European bʰlēw-Every word from Proto-Germanic blēwazEvery word from Proto-West Germanic blāu