Where does “flu” come from?

flu (French) comes from English flu, from English influenza, from Italian influenza, from Latin īnfluentia, from Latin īnfluēns, from Latin īnfluō, from Latin īn-, from Latin în — in.

flu (French): diarrhea

Definitions

  1. diarrhea

Ancestry of “flu”, step by step

StepLanguageWordMeaning
1EnglishfluInfluenza; Stomach flu
2EnglishinfluenzaAn acute contagious disease of the upper airways...
3Italianinfluenzainfluence; influenza, flu; third-person singular...
4Latinīnfluentiainfluence
5Latinīnfluēnsflowing into
6Latinīnfluōto flow or run into
7Latinīn-un-, non-, not
8Latinînin, at, on, upon, from (space)
9Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
10Proto-Italicenin
11Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₁én