Etymology

bladder

blad·der
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Today it means: A flexible sac that can expand and contract and that holds liquids or gases. Full definition →

Middle English bladdre ← Old English blæddre ← Proto-West Germanic *blādrā
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The story

  1. Proto-Germanic · inherited from*blēdrǭ
  2. Proto-West Germanic · inherited from*blādrā
  3. Old English · inherited fromblæddre
  4. Middle English · inherited frombladdre
  5. English todaybladder

From Middle English bladdre, bleddre, bladder, bledder, from Old English blæddre, a variant of blǣdre, blēdre (“blister, bladder”), from Proto-West Germanic *blādrā, from Proto-Germanic *blēdrǭ, *bladrǭ (“blister, bladder”).

Etymology from Wiktionary, CC BY-SA 4.0.