Main Entry: blad·der

Pronunciation: \ˈbla-dər\

Function: noun

Etymology: Middle English, from Old English blǣdre; akin to Old High German blātara bladder, Old English blāwan to blow

Date: before 12th century

1 a : a membranous sac in animals that serves as the receptacle of a liquid or contains gas; especially : urinary bladder b : cyst 2b
2 : something (as the rubber bag inside a football) resembling a bladder

— blad·der·like \-līk\ adjective