Coined in 1810 by French-Danish geographer Conrad Malte-Brun (as "langues indo-germaniques") and popularized in German (as indogermanisch), especially following J. Klapproth's 1823 Asia Polyglotta. At the time the term was coined, the Celtic languages were not yet considered Indo-European, and the Tocharian languages were not yet discovered; even after the inclusion of Celtic, Germanic remains the northwesternmost family (thanks to Icelandic).
- (dated, Indo-European studies) Indo-European (major language family)
- (dated, Indo-European studies) Proto-Indo-European (hypothetical language)
Indo-Germanic (not comparable)
- Winfred P. Lehmann, Historical Linguistics: An Introduction (2013, ISBN 1136902163), page 67: "Since the Germanic family is located farthest to the north and west, many scholars, especially in Germany, label the family Indo-Germanic by the designation proposed in 1810 by Conrad Malte-Brun."
- ^ The Oxford Introduction to Proto-Indo-European (2006, ISBN 0191058122)