Where does “fluid” come from?

fluid (Middle English) comes from Latin fluidus, from Latin fluō, from Proto-Indo-European bʰléh₁-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “fluid”, step by step

Step	Language	Word	Meaning
1	Latin	fluidus	liquid, fluid, flowing; soft, feeble, moist
2	Latin	fluō	—
3	Proto-Indo-European	bʰléh₁-	—
4	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
5	Proto-Indo-European	bʰōl-	—

Words derived from “fluid”

fluid
microfluidic
fluidly
fluidic
superfluid
microfluidics
fluidization
ferrofluid
semifluid
geofluid
fluidics
nanofluidic
biofluid
fluidize
fluidal
nanofluidics
nanofluid
fluidisation
fluidlike
fluidify
multifluid
microfluidization
fluidness
nonfluid

Every word from Proto-Indo-European bʰōl- →

fluid — Etymology, Origin & Word History | Etymology Explorer