<synset id="n02467746" type="n">
<lex_filenum>05<lex_filenum/>
<word lex_id="1">air sac<word/>
<pointer refs="n05515670">Hypernym<pointer/>
<pointer refs="n01503061">Part holonym<pointer/>
<def>any of the membranous air-filled extensions of the lungs of birds<def/>
<synset/>