The Collaborative International Dictionary of English v.0.48:

Teutonic \Teu*ton"ic\, a. [L. Teutonicus, from Teutoni, or
   Teutones. See Teuton.]
   1. Of or pertaining to the Teutons, esp. the ancient Teutons;
      Germanic.
      [1913 Webster]

   2. Of or pertaining to any of the Teutonic languages, or the
      peoples who speak these languages.
      [1913 Webster]

   Teutonic languages, a group of languages forming a division
      of the Indo-European, or Aryan, family, and embracing the
      High German, Low German, Gothic, and Scandinavian dialects
      and languages.

   Teutonic order, a military religious order of knights,
      established toward the close of the twelfth century, in
      imitation of the Templars and Hospitalers, and composed
      chiefly of Teutons, or Germans. The order rapidly
      increased in numbers and strength till it became master of
      all Prussia, Livonia, and Pomerania. In its decay it was
      abolished by Napoleon; but it has been revived as an
      honorary order.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Teutonic \Teu*ton"ic\, n.
   The language of the ancient Germans; the Teutonic languages,
   collectively.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Teutonic
    adj 1: of or pertaining to the ancient Teutons or their
           languages; "Teutonic peoples such as Germans and
           Scandinavians and British"; "Germanic mythology" [syn:
           Teutonic, Germanic]