The Spanish word 'facial' comes from Medieval Latin 'facialis' meaning 'of the face'. This Medieval Latin term was formed by combining the Latin word 'facies' meaning 'face' with the Latin suffix '-alis' meaning 'relating to'. This combination literally means 'relating to the face', which is exactly how it's used in modern Spanish.

Some related and commonly used Spanish words include 'faz' (face), which is a direct descendant of Latin 'facies', and 'superficie' (surface), which literally meant 'face above' in Latin. These words share the same facial/face root and help demonstrate how this word family evolved in Spanish.

English speakers might recognize this word easily because it's identical to the English word 'facial'. Both Spanish and English borrowed this word from the same Latin source. Other related English words include 'face', 'surface' (which literally meant 'above face'), and 'facet' (a small face or surface). The word 'face' itself came to English through Old French, but ultimately traces back to the same Latin root 'facies'.