People who harbor a Friday the 13th superstition might have triskaidekaphobia, or fear of the number 13, and often pass on their belief to their children, he noted.
-- John Roach, "Why Does Friday the 13th Scare Us So Much?" National Geographic, September 12, 2013
In medical school, while Sergei was busy composing a paper on anxiety disorders, Alexander beat him to publication with an exemplary dissertation on the combined effects of triskaidekaphobia and coulrophobia.
-- Christopher Meades, The Last Hiccup, 2012
Triskaidekaphobia derives from the Greek word for thirteen, triskaídeka and the Greek word for fear, phobos. It entered English in the early 1900s.