The Spanish word 'delicioso' (meaning 'delicious') comes from the Latin word 'deliciosus' meaning 'delightful'. This Latin word was formed from two parts: 'deliciae' meaning 'delights' or 'pleasures', and the suffix '-osus' meaning 'full of'. Going even further back, 'deliciae' itself was constructed from the prefix 'de-' (meaning 'down, away') and the verb 'lacere' (meaning 'to entice or seduce'). So etymologically, something 'delicioso' is literally 'full of things that entice or attract'!

A related Spanish word is 'delicia' (meaning 'delight' or 'treat'), which comes directly from the same Latin root 'deliciae'. When something is particularly enjoyable or pleasant, Spanish speakers might exclaim '¡Qué delicia!' (What a delight!). The connection between 'delicia' and 'delicioso' is clear - something that is 'delicioso' provides 'delicia' or delight.

English speakers will immediately recognize the connection to the word 'delicious', which shares the exact same Latin ancestry as 'delicioso'. Another related English word is 'delicate', which also comes from Latin 'deliciae', though its meaning evolved to focus more on fineness or fragility rather than pleasure. The word 'delight' is also a cousin, though it came to English through Old French, ultimately from the same Latin root meaning 'to entice or attract'.