noun. The definition of a megapod, also spelled megapode, is a member of the family Megapodiidae, which are large-footed, ground-dwelling birds in the East Indies, South Pacific and Australia.An example of a megapod is a bird that buries their eggs to hatch them.mega- + -pod. large-footed.oun. The definition of a megapod, also spelled megapode, is a member of the family Megapodiidae, which are large-footed, ground-dwelling birds in the East Indies, South Pacific and Australia.