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triskaidekaphobia \tris-ky-dek-uh-FOH-bee-uh\, noun:
Fear or a phobia concerning the number 13.
Despite NASA's seemingly ingrained case of triskaidekaphobia, which forced managers to impose the bizarre, '13-free' numbering system on its flights, the crew of perhaps the most important Shuttle mission to date clearly were unsure if STS-41C was supposed to be unlucky or not.
-- Ben Evans, Space Shuttle Challenger: Ten Journeys into the Unknown
Triskaidekaphobia is from Greek treiskaideka, triskaideka, thirteen (treis, three + kai, and + deka, ten) + phobos, fear.
Some famous triskaidekaphobes1:
- Herbert Hoover
- Mark Twain
- Richard Wagner
- Franklin Roosevelt
1. Source: "It's just bad luck that the 13th is so often a Friday," Electronic Telegraph, September 8, 1996