"Triskaidekaphobia": The fear of the number 13

"Triskaidekaphobia" is a term derived from Greek roots, and it refers to the fear of the number 13. 

Here's the breakdown of its etymology:

"Tris" (τρις) in Greek means "three."

"Kai" (καί) in Greek means "and."
"Deka" (δέκα) in Greek means "ten."

So, when you combine these elements:

"Tris" (three)
"Kai" (and)
"Deka" (ten)

You get "triskaideka," which means "thirteen" in Greek.

The latter part of the word, "phobia," is a common suffix used to denote fear or aversion.

So, "triskaidekaphobia" literally means the fear of the number 13, and it has its roots in the ancient Greek language. The fear of the number 13 has been considered unlucky in various cultures and is the basis for many superstitions, leading to the creation of this term.