Historical reference: Do not rely on this information. It is very old. About this collection
Indo-Germanic, an expression formerly, and sometimes even still, employed,.mainly by German writers, as synonymous with Aryan. But it has deservedly fallen into general disuse, being quite inadequate, inasmuch as it leaves out the Iranic, Hellenic, Keltic, Italic, and Slavic members of that family. [Aryan Races and Languages.]