The Collaborative International Dictionary of English v.0.48:

Star-spangled \Star"-span`gled\ (st[aum]r"-sp[a^][ng]`g'ld), a.
   Spangled or studded with stars.
   [1913 Webster]

   Star-spangled banner, the popular name for the national
      ensign of the United States; also the name of a poem, the
      words of which were composed by Francis Scott Key, which
      was adopted as the national anthem of the United States.
      --F. S. Key.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Star-Spangled Banner
    n 1: the national flag of the United States of America [syn:
         American flag, Stars and Stripes, Star-Spangled
         Banner, Old Glory]