The Spanish verb 'murar' means 'to wall' or 'to surround with walls'. It comes from the Latin word 'murus' meaning 'wall'. The Spanish noun 'muro' (wall) was derived directly from Latin 'murus', and then the verb 'murar' was formed by adding the common Spanish verb suffix '-ar' to 'muro'.

This is a straightforward example of how Spanish verbs can be created from nouns by adding the '-ar' suffix, similar to how English sometimes turns nouns into verbs by adding nothing at all (like 'wall' becoming 'to wall off').

The most common related Spanish word is 'muro' (wall), which is much more frequently used than the verb 'murar'. You might also encounter 'muralla' (city wall, rampart) and 'mural' (wall painting), which are both derived from the same Latin root.

English speakers might recognize the connection to words like 'mural' (a wall painting) and 'immure' (to enclose within walls), which come from the same Latin root 'murus'. The word 'intramural' (occurring within the walls or boundaries of an institution) also contains this root.