The Spanish word 'apnea' comes from Ancient Greek through Latin. It was formed from two Greek elements: 'a-' meaning 'without' and 'pnein' meaning 'to breathe'. These combined to form the Greek word 'ápnoia' meaning 'without breathing'. This term was borrowed into Latin as 'apnoea' with the same meaning, and eventually made its way into Spanish as 'apnea'.

The word literally describes a state of not breathing, which perfectly matches its modern medical usage referring to episodes where breathing stops temporarily, as in sleep apnea.

While 'apnea' itself is a relatively specialized medical term in Spanish, you might recognize the 'a-' prefix (meaning 'without' or 'not') in other Spanish words like 'anormal' (abnormal) or 'atípico' (atypical).

English speakers might recognize this word easily as it's identical to the English word 'apnea' (also spelled 'apnoea' in British English). The same Greek roots appear in other English breathing-related words like 'pneumonia', 'pneumatic', and 'dyspnea', all of which contain the Greek root 'pne-' relating to breathing.