n02467581
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<synset id="n02467581" type="n"> <lex_filenum>05<lex_filenum/> <word lex_id="0">air bladder<word/> <word lex_id="0">swim bladder<word/> <word lex_id="0">float<word/> <pointer refs="n05515670">Hypernym<pointer/> <def>an air-filled sac near the spinal column in many fishes that helps maintain buoyancy<def/> <synset/>