This word is a relatively recent invention, likely coined in the late 20th or early 21st century. It describes the fear of the number 666. While the word itself is not in the dictionary, the fear of the number 666 is a well-known concept, and it has been recognized for centuries.
Here's why the word might not be in the dictionary:
* Newly coined: The word is quite new, and dictionaries tend to have a lag in adding newly coined words.
* Rarity: While the fear of 666 is known, it's not a common phobia, and the term might not be widely used.
* Specificity: The dictionary focuses on common words and concepts, and a specific phobia related to a single number might not be considered essential.
If you're looking for the definition of "hexakosioihexekontahexaphobia," you can find it in online dictionaries or resources that focus on phobias.