1520s, blether, Scottish, probably from a Scandinavian source such as Old Norse blaðra "mutter, wag the tongue," perhaps of imitative origin, or from Proto-Germanic *blodram "something inflated" (the source of bladder). Related: Blathered; blathering.
blather (n.)
"nonsense, foolish talk," 1787, blether, from blather (v.).
blastocyst
blast-off
blastula
blat
blatant
blather
blatherskite
blaxploitation
blaze
blazer
blazes
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