-gaster
\|gastə(r), |gaas-, |gais-\  noun combining form 
(-s) 
Etymology: New Latin, from Greek gastēr 
1. : part having a (specified) relation to the stomach 
< mesogaster >
< metagaster >
2. : organism having a (specified) type of digestive tract  — especially in generic names
< Microgaster >
< myxogaster >
1.
< mesogaster >
< metagaster >
2.
< Microgaster >
< myxogaster >