Where does “fíor-” come from?

fíor- (Irish) comes from Irish fíor, from Old Irish fír, from Proto-Celtic wīros, from Proto-Indo-European weh₁ros, from Proto-Indo-European weh₁- — true.

fíor- (Irish): real, true, genuine; noble

Definitions

real, true, genuine; noble

Ancestry of “fíor-”, step by step

Step	Language	Word	Meaning
1	Irish	fíor	true; correct; real
2	Old Irish	fír	true; truth
3	Proto-Celtic	wīros	true
4	Proto-Indo-European	weh₁ros	true
5	Proto-Indo-European	weh₁-	true

Words derived from “fíor-”

fíorchneas
fíormhaith

Every word from Proto-Indo-European weh₁- →Every word from Proto-Indo-European weh₁ros →Every word from Proto-Celtic wīros →