The Spanish word 'araña' (meaning 'spider') comes from the Latin word 'aranea', which also meant 'spider'. The Latin term existed alongside the Ancient Greek word 'ἀράχνη' (arakhne), also meaning 'spider'. As Latin evolved into Spanish, 'aranea' underwent sound changes, with the middle 'e' being lost and the final 'a' being softened with the Spanish 'ñ' sound, resulting in the modern Spanish 'araña'.

The word 'araña' has given rise to several related Spanish words that are commonly used. For example, 'telaraña' combines 'tela' (web, fabric) and 'araña' to mean 'spider web'. The verb 'arañar' meaning 'to scratch' or 'to claw' comes from the same root, referring to the spider-like scratching motion.

English speakers might recognize the Greek root 'arakhne' in words like 'arachnid' (the scientific classification for spiders and their relatives) and 'arachnophobia' (the fear of spiders). While English didn't inherit the Latin 'aranea' directly like Spanish did, these scientific terms were created using the Greek root to refer to spider-related concepts.