The Collaborative International Dictionary of English v.0.48:

Oscines \Os"ci*nes\, n. pl. [L. oscen, -inis.] (Zool.)
   Singing birds; a group of the Passeres, having numerous
   syringeal muscles, conferring musical ability.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Oscines
    n 1: two names for the suborder of typical songbirds [syn:
         Oscines, suborder Oscines, Passeres, suborder
         Passeres]