What is the meaning of 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.
• 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.
  • synonyms: wanderer
• A skillet made of cast iron. .