spider (Noun) — Predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for prey.
spider (Noun) — A computer program that prowls the internet looking for publicly accessible resources that can be added to a database; the database can then be searched with a search engine.
spider (Noun) — A skillet made of cast iron.
spider (Verb) — (computing) automatically follow links on the internet in order to gather information from many linked pages. ex. "my home page is regularly spidered by search engines"