NOUN (3)

1. (historically) a member of the nomadic people of the Syrian and Arabian deserts at the time of the Roman Empire;

2. (when used broadly) any Arab;

3. (historically) a Muslim who opposed the Crusades;

The Collaborative International Dictionary of English v.0.48:

Saracen \Sar"a*cen\, n. [L. Saracenus perhaps fr. Ar. sharqi,
   pl. sharqi[imac]n, Oriental, Eastern, fr. sharaqa to rise,
   said of the sun: cf. F. sarrasin. Cf. Sarcenet, Sarrasin,
   Sirocco.]
   Anciently, an Arab; later, a Mussulman; in the Middle Ages,
   the common term among Christians in Europe for a Mohammedan
   hostile to the crusaders.
   [1913 Webster]

   Saracens' consound (Bot.), a kind of ragwort (Senecio
      Saracenicus), anciently used to heal wounds.
      [1913 Webster] Saracenic

WordNet (r) 3.0 (2006):

Saracen
    n 1: (historically) a member of the nomadic people of the Syrian
         and Arabian deserts at the time of the Roman Empire
    2: (when used broadly) any Arab
    3: (historically) a Muslim who opposed the Crusades