The Collaborative International Dictionary of English v.0.48:

Abdominous \Ab*dom"i*nous\, a.
   Having a protuberant belly; pot-bellied.
   [1913 Webster]

         Gorgonius sits, abdominous and wan,
         Like a fat squab upon a Chinese fan.     --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

abdominous
    adj 1: having a large belly [syn: abdominous, paunchy,
           potbellied]