As a side-note on Mr. Hughes - from:
http://wordways.com/ghost.htm

GHOST WORDS
by Murray Pearce
Word Ways, 1986

Lexicographers are human, and as a result their dictionaries contain errors, not many to be sure, but lengthy lists of errors in Webster's New International Dictionary, Second and Third Editions (Web 2 and Web 3) have been presented in past issues of Word Ways. These errors consist for the most part of misspellings, words out of alphabetical order and missing cross-references or variants mentioned in definitions. Even the fact that a word is missing (WOULDN'T in early printings of Web 3) has been cited as an error. A rarer type of error is the inclusion in a dictionary of a non-word or "ghost word," a term coined by etymologist Walter Skeat in 1886. On occasion such inclusion is not an error but a hoax, admitted or not, on the part of the compiler. The most famous of such words is ZZXJOANW, the last word in the Dictionary of Terms section of the Music Lovers' Encyclopedia compiled by Rupert Hughes in 1903 and revised and newly edited by Deems Taylor and Russell Kerr in 1939. Purporting to be a Maori word defined variously as "drum," "fife," and "conclusion," the legitimacy of the word was thoroughly demolished by Philip Cohen in "What's the Good Word?" in the November 1976 Word Ways.