It comes from the Greek word ἀράχνη (arachnē), which means "spider".
This prefix is often used in scientific terms related to spiders, their webs, or their characteristics. For example:
* Arachnid: An arthropod belonging to the class Arachnida, which includes spiders, scorpions, ticks, and mites.
* Arachnology: The branch of zoology that studies spiders and their relatives.
* Arachnophobia: An extreme and irrational fear of spiders.