The Collaborative International Dictionary of English v.0.48:

Aquiline \Aq"ui*line\ (?; 277), a. [L. aquilinus, fr. aquila
   eagle: cf. F. aquilin. See Eagle. ]
   1. Belonging to or like an eagle.
      [1913 Webster]

   2. Curving; hooked; prominent, like the beak of an eagle; --
      applied particularly to the nose
      [1913 Webster]

            Terribly arched and aquiline his nose. --Cowper.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aquiline
    adj 1: curved down like an eagle's beak [syn: aquiline,
           hooked]