parallelable
/ˌparəˈlɛləbl/adjective
That can be paralleled or made parallel; capable of being paralleled or matched. Now chiefly (Electrical Engin. ): (of electrical apparatus) that can be connected in parallel.
Origin
Mid 17th century; earliest use found in Joseph Hall (1574–1656), bishop of Norwich, religious writer, and satirist. From parallel + -able.