monogastric
/ˌmɒnə(ʊ)ˈɡastrɪk/adjective
1 Anatomy. Of a muscle: having a single ‘belly’ or fleshy part; (originally) specifically †designating the tensor tympani ( obsolete ). Compare digastric rare.
2 Zoology. Of an animal: having a single stomach or digestive cavity.
Origin
Mid 18th century; earliest use found in Philosophical Transactions Abridged 1665–1700. From post-classical Latin monogastricus from mono- + gastricus. With sense 1, compare earlier digastric.