The Spanish word 'adorno' (meaning 'ornament' or 'decoration') comes from the Spanish verb 'adornar' ('to adorn'), which in turn derives from the Latin verb 'adornare' with the same meaning. The Latin 'adornare' was formed by combining two elements: the prefix 'ad-' meaning 'toward' and the verb 'ornare' meaning 'to equip' or 'to adorn'. This combination created a verb that emphasized the act of adding decoration or embellishment to something.

Some related Spanish words that might be familiar to Spanish learners include 'adornar' (the verb 'to adorn' or 'to decorate'), 'adornado' (meaning 'adorned' or 'decorated'), and 'ornamento' (meaning 'ornament'). All these words share the same Latin root related to decoration and embellishment.

English speakers might recognize the connection to words like 'adorn', 'adorned', and 'ornament', which all come from the same Latin roots. The English word 'ornate' (meaning elaborately decorated) also shares this etymology. These words maintain the core meaning of decoration and embellishment across both languages.