/ ˈblædə(r); NAmE / noun
1.
an organ that is shaped like a bag in which liquid waste (= urine ) collects before it is passed out of the body
—see also gall bladder —picture at organ
2.
a bag made of rubber, leather, etc. that can be filled with air or liquid, such as the one inside a football
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WORD ORIGIN
Old English blǣdre , of Germanic origin; related to Dutch blaar and German Blatter , also to the verb blow .