
1) Dungeon & Dragons creature 2) Female sprite 3) Germanic water spirit 4) Greek girl name 5) Slang for nothing 6) Undeliverable letter 7) Undeliverable piece of mail 8) Water sprite
Found on
https://www.crosswordclues.com/clue/nixie
[postal] A Nixie is an undeliverable-as-addressed mailing. As used by the United States Postal Service, a Nixie is distinguished from other address errors in that the mail piece is always returned to the sender. (Vs. a Change of Address (COA) which can either be forwarded or returned to the sender corrected/notified.) The term itself has be...
Found on
http://en.wikipedia.org/wiki/Nixie_(postal)

• (n.) See Nix. • (n.) See Nix. • A piece of mail matter which cannot be delivered, either because no post office exists at the place to which is it addressed, or because there is no place of the name mentioned in the designated State, Territory, or the like. • Nothing.
Found on
http://thinkexist.com/dictionary/meaning/nixie/

The return, by post office, of a mailing piece which proves undeliverable because of inaccurate name or address. Most mailers process such returns against records to eliminate invalid or inactive names.
Found on
http://www.encyclo.co.uk/local/21134
Nix'ie 1. Nothing. [ Slang]
2. (U. S. Mail Service) A piece of mail matter which cannot be delivered, either because no post office exists at the place to which is it addressed, or because there is no place of the name mentioned in the designated State, Territory, or the like. [ Cant]
Found on
http://www.encyclo.co.uk/webster/N/25
Nix'ie noun See
Nix .
Found on
http://www.encyclo.co.uk/webster/N/25

A bad address. A mailing piece returned to a mailer (under proper authorization) by the Postal Service because of an incorrect, or undeliverable, name and address. In direct mail, nixies will precede any responses.
Found on
http://www.nmoa.org/Library/index.htm

Nixie is slang for nothing.
Found on
http://www.probertencyclopaedia.com/browse/ZN.HTM

a water-fairy.
Found on
http://www.telelib.com/authors/S/ScottWalter/prose/pirate/glossary.html

a letter or parcel that is undeliverable by the post office because of a faulty or illegible address.
Found on
https://www.infoplease.com/dictionary/nixie
No exact match found.