The Spanish word 'alvéolo' comes from the Latin word 'alveolus', meaning 'small cavity'. The Latin 'alveolus' was formed by combining 'alveus' (meaning 'cavity') with the diminutive suffix '-olus'. This combination literally meant 'little cavity' in Latin, and this meaning has carried forward to modern Spanish where 'alvéolo' refers to small anatomical cavities like the air sacs in lungs (pulmonary alveoli) or the tooth sockets in the jaw (dental alveoli).

While 'alvéolo' is a somewhat technical term in Spanish, it doesn't have many common related words in modern Spanish. However, you might encounter it frequently in medical or anatomical contexts.

The English word 'alveolus' (plural 'alveoli') is directly related to Spanish 'alvéolo', as both come from the same Latin source. In English, like in Spanish, it refers to small anatomical cavities, particularly in the lungs or jaw. The adjective form 'alveolar' is also used in English, especially in linguistics to describe sounds made with the tongue near the alveolar ridge (the ridge behind the upper teeth).