The Spanish word 'antebrazo' (forearm) is a compound word formed from two parts: 'ante-' meaning 'before/in front of' (from Latin 'ante') and 'brazo' meaning 'arm'. The 'brazo' portion can be traced back to Latin 'brachium', which itself comes from Ancient Greek 'βραχίων' (brachíon), both meaning 'arm'. The compound literally means 'before-arm' or 'in front of the arm', which perfectly describes the forearm's position relative to the upper arm.

The simpler Spanish word 'brazo' (arm) is directly related to 'antebrazo', being one of its component parts. Other common Spanish words using the 'ante-' prefix include 'antesala' (anteroom), 'anteayer' (the day before yesterday), and 'antepasado' (ancestor) - all using the concept of 'before' or 'in front of'.

English speakers might recognize the connection to several anatomical terms: 'brachial' (relating to the arm), 'bracelet' (originally something worn on the arm), and words like 'antibrachial' (relating to the forearm) which uses the same anatomical terminology. The 'ante-' prefix is also common in English words like 'anterior' (front), 'antecedent' (something that comes before), and 'anteroom' (a room that leads to another).