The Spanish word 'añadido' (meaning 'added') comes from the Spanish verb 'añadir' ('to add'). This verb developed from the Vulgar Latin '*inaddere', which was formed by combining two Latin elements: the prefix 'in-' meaning 'in, into' and the verb 'addere' meaning 'to add'. The combination created a reinforced meaning of 'to add to'. Over time, as the word evolved from Vulgar Latin to Spanish, the 'in-' prefix merged with the base word and underwent phonetic changes, resulting in the modern Spanish form 'añadir', whose past participle is 'añadido'.

A simpler and very common related Spanish word is the verb 'añadir' itself, which is the base verb meaning 'to add'. You'll frequently encounter this verb in cooking recipes, instructions, or any context where adding or including something is discussed.

The English word 'add' is a cousin of 'añadido', as both can be traced back to the Latin 'addere'. While English inherited 'add' through Old French, Spanish developed its word by adding the prefix 'in-' to the same Latin root, resulting in a slightly different but related word. Understanding this connection can help English speakers remember that 'añadir' means 'to add' and 'añadido' means 'added'.