What is "triskaidekaphobia"

"fear of the number 13," 1908, also triskaidecaphobia, from Greek treiskaideka, triskaideka "thirteen" (from treis "three" + deka "ten") + -phobia "fear."

n. fear, hate, or dislike of the number thirteen (13).

n. a morbid fear of the number 13

Triskaidekaphobia (, or ; from Greek tris meaning "three", kai meaning "and", deka meaning "10" and phobos meaning "fear" or "morbid fear") is fear of the number and avoidance to use it. It is also a reason for the fear of Friday the 13th, called paraskevidekatriaphobia (from Παρασκευή Paraskevi, Greek for Friday) or friggatriskaidekaphobia (after Frigg, the Norse goddess after whom Friday is named in English).

The term was first used by Isador Coriat in Abnormal Psychology.