The Collaborative International Dictionary
Agastric
Agastric \A*gas"tric\ ([.a]*g[a^]s"tr[i^]k), a. [Gr. 'a priv. + gasth'r stomach.] (Physiol.) Having to stomach, or distinct digestive canal, as the tapeworm.
Wiktionary
agastric
a. (context biology English) Having no alimentary canal; lacking a stomach, intestines, or digestive tract.