NOUN (1)

1. a person who is opposed to the United States and its policies;


ADJECTIVE (1)

1. opposed to the United States and its policies;

The Collaborative International Dictionary of English v.0.48:

Anti-American \An`ti-A*mer"i*can\, a.
   Opposed to the Americans, their aims, or interests, or to the
   genius of American institutions. --Marshall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anti-American
    adj 1: opposed to the United States and its policies [ant: pro-
           American]
    n 1: a person who is opposed to the United States and its
         policies