Aerophagia
ahd-5
noun.
The swallowing of excess air, resulting in abdominal bloating and belching.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
aerophagy
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
swallowing air (usually followed by belching and discomfort and flatulence)