bladder
BLAD-er · noun
Origin
From Middle English bladdre, bleddre, bladder, bledder, from Old English blæddre, a variant of blǣdre, blēdre meaning 'blister, bladder,' from Proto-West Germanic *blādrā, from Proto-Germanic *blēdrǭ, *bladrǭ, meaning 'blister, bladder.'
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Journey
The Old English form already carried both senses — 'blister' and 'bladder' — showing the word long described any thin-skinned, fluid-filled swelling rather than one specific body part.