Etymology 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”).
Biology, Natural sciences, Zoology A flexible sac that can expand and contract and that holds liquids or gases.
2
Anatomy, Medicine, Sciences Specifically, the urinary bladder.
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Biology, Botany, Natural sciences A hollow, inflatable organ of a plant.
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The inflatable bag inside various balls used in sports, such as footballs and rugby balls.
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A container in the form of a flexible bag.
a fuel bladder
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A sealed plastic bag that contains wine and is usually packaged in a cask.
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Figuratively Anything inflated, empty, or unsound.
to swim with bladders of philosophy1711, Anthony Ashley-Cooper, 3rd Earl of Shaftesbury, “Sensus Communis”, in Characteristicks of Men, Manners, Opinions, Times:
Etymology 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”).
1
To swell out like a bladder with air; to inflate.
bladder'd up with pride of his own merit1610, Giles Fletcher, Christ's Victorie and Triumph, in Heaven, in Earth, over and after Death: