The Collaborative International Dictionary of English v.0.48:

Accentor \Ac*cen"tor\, n. [L. ad. + cantor singer, canere to
   sing.]
   1. (Mus.) One who sings the leading part; the director or
      leader. [Obs.]
      [1913 Webster]

   2. (Zool.) A genus of European birds (so named from their
      sweet notes), including the hedge warbler. In America
      sometimes applied to the water thrushes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

accentor
    n 1: small sparrow-like songbird of mountainous regions of
         Eurasia