What is friggatriskaidekaphobia?

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A Phobia by Any Other Name According to The Skeptic's Dictionary, friggatriskaidekaphobia is "a morbid, irrational fear of Friday the 13th."

And just in case you didn't know this either, friggatriskaidekaphobia also happens to be a synonym of paraskevidekatriaphobia.

(See Related links for a fascinating read on the history of these two words.)
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What is the difference between friggatriskaidekaphobia and paraskevidekatriaphobia?

The difference is primarily one of word origin. Friggatriskaidekaphobia starts with a Greek-originated term "triskaidekaphobia" or the fear of the number 13 (triskaideka = 13,