NOUN (2)

1. a German man; used before the name as a title equivalent to Mr in English;

2. a German courtesy title or form of address for a man;

The Collaborative International Dictionary of English v.0.48:

Herr \Herr\, n.
   A title of respect given to gentlemen in Germany, equivalent
   to the English Mister.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Herr
    n 1: a German man; used before the name as a title equivalent to
         Mr in English
    2: a German courtesy title or form of address for a man