Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a name used in law courts, legal papers, etc. to refer to a person whose actual name is unknown, esp. to the second person of two when both names are unknown (the first person being referred to as John Doe)
Origin: see Doe
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Used as a name in legal proceedings to designate an unknown or unidentified man or boy, especially the second of two such persons, the first usually being named John Doe.