The word dord is a dictionary error in lexicography. It was accidentally created, as a ghost word, by the staff of G. and C. Merriam Company (now part of Merriam-Webster) in the New International Dictionary, second edition (1934). That dictionary defined the term a synonym for density used in physics and chemistry in the following way: "dord (dôrd), n. Physics & Chem. Density."
Philip Babcock Gove, an editor at Merriam-Webster who became editor-in-chief of Webster's Third New International Dictionary, wrote a letter to the journal American Speech, fifteen years after the error was caught, in which he explained how the "dord" error was introduced and corrected.
On July 31, 1931, Austin M. Patterson, the dictionary's chemistry editor, sent in a slip reading "D or d, cont./density." This was intended to add "density" to the existing list of words that the letter "D" can abbreviate. The phrase "D or d" was misinterpreted as a single, run-together word: Dord. This was a plausible mistake, because headwords on slips were typed with spaces between the letters, so "D or d" looked very much like "D o r d". The original slip went missing, so a new slip was prepared for the printer, which assigned a part of speech (noun) and a pronunciation. The would-be word was not questioned or corrected by proofreaders. The entry appeared on page 771 of the dictionary around 1934, between the entries for Dorcopsis (a type of small kangaroo) and doré (golden in color).
On February 28, 1939, an editor noticed "dord" lacked an etymology and investigated, discovering the error. An order was sent to the printer marked "plate change/imperative/urgent". The non-word "dord" was excised; "density" was added as an additional meaning for the abbreviation "D or d" as originally intended, and the definition of the adjacent entry "Doré furnace" was expanded from "A furnace for refining dore bullion" to "a furnace in which dore bullion is refined" to close up the space. Gove wrote that this was "probably too bad, for why shouldn't dord mean 'density'?" In 1940, bound books began appearing without the ghost word, although inspection of printed copies well into the 1940s show "dord" still present. The entry "dord" was not completely removed until 1947.
- Boole's rule, a mathematical rule of integration sometimes known as Bode's rule, due to a typographical error in Abramowitz and Stegun (1972, p. 886) that was subsequently propagated
- Fictitious entry
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- Phono-semantic matching
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- Eschner, Kat (28 February 2017). "As "Dord" Shows, Being in the Dictionary Doesn't Always Mean Something's a Word". Smithsonian. Retrieved 17 March 2017.
- Mikkelson, David (4 January 2015). "Dord: The Word That Didn't Exist". Snopes.com. Retrieved 6 March 2019.
- Gove, Philip Babcock (1954). "The History of 'Dord'". American Speech. 29: 136–138.
- "Erroneous word "Dord" is discovered in dictionary". History Channel. Retrieved 17 March 2017.
- Neilson, William Allan, ed. (1943). "dord". Webster's New International Dictionary (Second ed.). G. & C. Merriam Company.
- Brewster, Emily. "Ask the Editor: Ghost Word". Merriam-Webster.com.
- Weisstein, Eric W. "Boole's Rule". MathWorld.