Where does “*breitrā” come from?

*breitrā (Proto-Celtic) comes from Proto-Indo-European bʰerH- — to pierce; to strike; brown.

Ancestry of “*breitrā”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	bʰerH-	to pierce; to strike; brown

*breitrā — Etymology, Origin & Word History | Etymology Explorer