Source : Webster's Revised Unabridged Dictionary (1913)

Marchpane \March"pane`\, n. [Cf. It. marzapane,Sp. pan,.
   massepain, prob. fr. L. maza frumenty (Gr. ma^za) + L. panis
   bread; but perh. the first part of the word is from the name
   of the inventor.]
   A kind of sweet bread or biscuit; a cake of pounded almonds
   and sugar. [Obs.]

Source : WordNet®

marchpane
     n : almond paste and egg whites [syn: {marzipan}]