coeliac plexus coe·liacp·le·xus uncommon noun 1. a large plexus of sympathetic nerves in the abdomen behind the stomach Synonymssolar plexuscoeliac plexusplexus celiacusabdominal nerve plexus Related words Broader terms nerve plexus Parts sympathetic nervous system WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
