From Indo- + Germanic, relating to the two geographically most extreme subgroupings, the Indo-Aryan and the Germanic languages. (When this term was coined, the Celtic languages were not yet considered Indo-European, and the Tocharian languages were not yet discovered.) While the classification is considered obsolete and the term fell out of use, it was adopted into some languages, cf. German indogermanisch.
Indo-Germanic (not comparable)