The Collaborative International Dictionary of English v.0.48:

Ovenbird \Ov"en*bird`\, n. (Zool.)
   (a) Any species of the genus Furnarius, allied to the
       creepers. They inhabit South America and the West Indies,
       and construct curious oven-shaped nests.
   (b) In the United States, Seiurus aurocapillus; -- called
       also golden-crowned thrush.
   (c) In England, sometimes applied to the willow warbler, and
       to the long-tailed titmouse.
       [1913 Webster]

WordNet (r) 3.0 (2006):

ovenbird
    n 1: American warbler; builds a dome-shaped nest on the ground
         [syn: ovenbird, Seiurus aurocapillus]
    2: small brownish South American birds that build oven-shaped
       clay nests