Where does “blue supergiant” come from?

blue supergiant (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 supergiant (English): A very large, hot and luminous star; a large blue giant

Definitions

  1. A very large, hot and luminous star; a large blue giant

Ancestry of “blue supergiant”, step by step

blue supergiant 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 supergiant

StepLanguageWordMeaning
1EnglishsupergiantA very large star having a mass between 10 and 70...
2Englishsuper-above, over, or upon; superior in size, quality,...
3Latinsuper-super-; over, above
4Latinsuper"accusative" above, on the top of, upon;...
5Latineks-uper
6Proto-Indo-Europeanupérialternative reconstruction of *upér
7Proto-Indo-Europeanupérabove; over
8Proto-Indo-Europeanupóunder, below
9Proto-Indo-Europeanh₃ewp-
Every word from Proto-Indo-European bʰlēw-Every word from Proto-Germanic blēwazEvery word from Proto-West Germanic blāu