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

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "gingerbread":
   Boston cream pie, angel cake, angel food cake, baked Alaska,
   bedizenment, bravery, cake, cheesecake, chiffon, chocolate cake,
   clinquant, coffee cake, cupcake, duplication,
   duplication of effort, embellishment, expletive, extravagance, fat,
   featherbedding, festoons, filling, finery, folderol, foofaraw,
   frill, frilliness, frilling, frills, frills and furbelows,
   frippery, froufrou, fruitcake, fuss, gaiety, gaudery, genoise,
   gilding, gilt, honey cake, jelly roll, jumble, layer cake, luxury,
   marble cake, needlessness, ornamentation, overadornment, overlap,
   padding, paste, payroll padding, pinchbeck, pleonasm, pound cake,
   prolixity, redundance, redundancy, savarin, shortcake, spice cake,
   sponge cake, superfluity, superfluousness, tautology, tea cake,
   tinsel, trappings, trickery, trumpery, unnecessariness, verbosity,
   white cake, yellow cake