The Collaborative International Dictionary of English v.0.48:

Megapode \Meg"a*pode\ (m[e^]g"[.a]*p[=o]d), n. [Mega- + Gr.
   poy`s, podo`s, foot.] (Zool.)
   Any one of several species of large-footed, gallinaceous
   birds of the genera Megapodius and Leipoa, inhabiting
   Australia and other Pacific islands. Called also mound
   builder, scrub fowl, moundbird, and brush turkey. See
   Jungle fowl
   (b) under Jungle, and Leipoa.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

moundbird \moundbird\, mound bird \mound bird\n. (Zool.)
   Any of several large-footed short-winged birds of
   Australasia, which build mounds of decaying vegetation to
   incubate eggs. Called also mound builder, mound maker,
   megapode, brush turkey, and scrub fowl.

   Syn: megapode, mound builder, scrub fowl, brush turkey.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

megapode
    n 1: large-footed short-winged birds of Australasia; build
         mounds of decaying vegetation to incubate eggs [syn:
         megapode, mound bird, mound-bird, mound builder,
         scrub fowl]