[insect anatomy] The gaster is the bulbous posterior portion of the metasoma found in Apocrita Hymenoptera (bees, wasps and ants). This begins with abdominal segment III on most ants, but some make a postpetiole out of segment III, in which case the gaster begins with abdominal segment IV. ... Found on http://en.wikipedia.org/wiki/Gaster_(insect_anatomy)
Type: Term Pronunciation: gas′tĕr Definitions: 1. Prominent part of wasp or ant abdomen, separated from the other body parts by a thin connecting segment. Synonyms: stomach Found on http://www.medilexicon.com/medicaldictionary.php?t=36369
the remaining abdominal segments after the waist or pedicel; the enlarged part of the abdomen that is usually referred to as the abdomen, proper. Found on https://www.encyclo.co.uk/local/21742