The Collaborative International Dictionary of English v.0.48:

Gingerbread \Gin"ger*bread`\, n.
   A kind of plain sweet cake seasoned with ginger, and
   sometimes made in fanciful shapes. "Gingerbread that was full
   fine." --Chaucer.
   [1913 Webster]

   Gingerbread tree (Bot.), the doom palm; -- so called from
      the resemblance of its fruit to gingerbread. See Doom
      Palm.

   Gingerbread work, ornamentation, in architecture or
      decoration, of a fantastic, trivial, or tawdry character.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gingerbread
    n 1: cake flavored with ginger