"Trio" is a complete word that means "a group of three." You might use it as part of a longer term, like "string trio" or "vocal trio," but "trio" itself doesn't have any prefixes.
"Trio" is a complete word that means "a group of three." You might use it as part of a longer term, like "string trio" or "vocal trio," but "trio" itself doesn't have any prefixes.