Where does “bletheren” come from?

bletheren (Middle English) comes from Old Norse blaðra, from Proto-Germanic blēdrǭ, from Proto-Indo-European bʰleh₁dʰreh₂(n).

Ancestry of “bletheren”, step by step

StepLanguageWordMeaning
1Old Norseblaðrabladder
2Proto-Germanicblēdrǭbladder
3Proto-Indo-Europeanbʰleh₁dʰreh₂(n)—

Words derived from “bletheren”

Every word from Proto-Indo-European bʰleh₁dʰreh₂(n) →Every word from Proto-Germanic blēdrǭ →Every word from Old Norse blaðra →
bletheren — Etymology, Origin & Word History | Etymology Explorer