Teutonic (adj.) Look up Teutonic at Dictionary.com
1610s, "of or pertaining to the Germanic languages and to peoples or tribes who speak or spoke them," from Latin Teutonicus, from Teutones, Teutoni, name of a tribe that inhabited coastal Germany near the mouth of the Elbe and devastated Gaul 113-101 B.C.E., probably via Celtic from Proto-Germanic *theudanoz, from PIE *teuta-, the common word for "people, tribe" (cognates: Lithuanian tauto, Oscan touto, Old Irish tuath, Gothic þiuda, Old English þeod "people, race, nation").

Used in English in anthropology to avoid the modern political association of German; but in this anthropological sense French uses germanique and German uses germanisch, because neither uses its form of German for the narrower national meaning (compare French allemand, for which see Alemanni; and German deutsch, under Dutch).

The Teutonic Knights (founded c.1191) were a military order of German knights formed for service in the Holy Land, but who later crusaded in then-pagan Prussia and Lithuania. The Teutonic cross (1882) was the badge of the order.