The Collaborative International Dictionary of English v.0.48:

Macaroon \Mac`a*roon"\, n. [F. macaron, It. maccherone. See
   Macaroni.]
   1. A small cake, composed chiefly of the white of eggs,
      almonds or coconut, and sugar.
      [1913 Webster]

   2. A finical fellow, or macaroni. [Obs.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

macaroon
    n 1: chewy cookie usually containing almond paste