The Spanish word 'visor' comes from the Latin word 'visor' meaning 'one who sees'. This Latin word was formed by combining the past participle 'visus' (meaning 'seen') from the verb 'videre' ('to see') with the agent suffix '-or'. The Spanish word has taken on a more specific meaning, referring to a viewer or viewfinder, particularly in cameras or other optical devices.

Several common Spanish words share this Latin root 'videre', including 'ver' (to see), 'vista' (view, sight), 'visible' (visible), and 'visión' (vision). All these words maintain a connection to the concept of seeing or viewing.

Many English words are related to this same Latin root, including 'vision', 'visible', 'visual', and even 'video'. The English word 'visor' itself is a cousin to the Spanish word, though in English it typically refers to a projecting piece on a cap or helmet to protect the eyes, maintaining the connection to vision and seeing. The word 'advisor' (or 'adviser') also contains this root, literally meaning 'one who sees to something' or 'one who looks at something'.