Stomato is defined as mouth.
An example of stomato used as a prefix is in the word stomatology which is the branch of medicine that involves the function and diseases of the mouth.
of, like, or relating to a mouth: stomatology
Origin of stomato-; from Classical Greek stoma (gen. stomatos), mouth: see stoma
Mouth; stoma: stomatitis.
Origin of stomato-From Greek stoma, stomat-, mouth.