Traveling home from a night at the movies with his parents, Bruce Wayne witnessed the murder of his parents. Since that day, he has sworn to defend the innocent from suffering the same loss.

noun

any of an order of furry, nocturnal [happening in the night] flying mammals having membranous [the thin covering or lining of organs] wings and navigating by echolocation [the general method of locating objects by determining the time it takes for an echo to return and from which direction it returns]

noun

the orderly of an officer in the British army