The Collaborative International Dictionary of English v.0.48:

Haggada \Hag*ga"da\ (h[a^]g*g[aum]"d[.a]), n.; pl. Haggadoth
   (-d[=o]th). [Rabbinic hagg[=a]dh[=a], fr. Heb. higg[imac]dh
   to relate.]
   A story, anecdote, or legend in the Talmud, to explain or
   illustrate the text of the Old Testament. [Written also
   hagada.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

Haggada
    n 1: Talmudic literature that does not deal with law but is
         still part of Jewish tradition [syn: Haggadah, Haggada,
         Hagada]