Webster's English Dictionary

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patagium

pa.ta.gi.um \p*-'ta--je--*m, .pat-*-'ji--\ \-*\ n or pa.ta.gia [NL, fr. L, 
   gold edging on a tunic] pl  : a wing membrane : as  : the fold of skin 
   connecting the forelimbs and hind limbs of a flying sq uirrel or dragon 
   lizard : the fold of skin in front of the main segments of a bird's wing