Dord
Dord is a non-existent word that, due to an editing mix-up, was listed for five years in Webster's New International Dictionary as a word meaning density. Prior to the mix-up, the word did not in fact exist. The confusion occurred when abbreviations were moved to a separate part of the dictionary, and a copyeditor misread "D or d", each of which is an abbreviation for density, as a single word. There is no real word "dord".
