The Spanish verb 'rasurar' (to shave) comes from Latin roots. It starts with the Latin verb 'radere' meaning 'to scrape or shave', which formed the past participle 'rasus' meaning 'shaved'. This was combined with the Latin suffix '-ura' (indicating the result of an action) to form 'rasura' meaning 'shaving or scraping'. Finally, the Spanish verb suffix '-ar' was added to create the modern Spanish verb 'rasurar'.

This etymology shows how the concept of shaving or scraping was preserved from Latin to Spanish, with the word being built up through different suffixes to create the final verb form.

A simpler related Spanish word is 'raso' (flat, smooth), which comes from the same Latin root 'rasus'. When something is shaved, it becomes smooth and flat, showing the semantic connection between these words. Another related word is 'rasura' itself, which in Spanish means 'shaving' or 'the act of shaving', directly preserved from Latin.

English speakers might recognize the connection to words like 'raze' (to completely destroy or level to the ground) and 'erase', both of which come from the same Latin root 'radere'. The connection makes sense when you think about how both shaving and razing involve scraping something away. The word 'razor' is also obviously related, being the tool used for shaving, and comes from the same Latin source.