## EnglishEdit

### EtymologyEdit

From *multi-* + *graph*. Compare *multiset*.

### NounEdit

**multigraph** (*plural* **multigraphs**)

- (mathematics, graph theory) A set
`V`(whose elements are called*vertices*or*nodes*), taken together with a multiset`E`, each of whose elements (called an*edge*or*line*) is a cardinality-two multisubset of`V`. - (mathematics, graph theory, less commonly) A set
`V`(as before), taken together with a multiset`E`, each of whose elements is a cardinality-two subset of`V`.