The Spanish word 'cólera' comes from the Latin 'cholera', which was borrowed from Ancient Greek 'χολέρα' (kholera). The Greek word was formed by combining 'χολή' (khole) meaning 'bile' with the suffix '-έρα' (-era). This etymology reflects the ancient medical understanding of cholera, which was associated with an imbalance of bodily fluids, particularly bile. The word maintained its form and meaning as it passed from Greek through Latin into Spanish, with only minor adjustments to fit Spanish pronunciation and spelling patterns.

The Spanish word 'colérico' (meaning 'angry' or 'choleric') is closely related to 'cólera'. Both words reflect the ancient belief that an excess of bile was responsible for both the disease cholera and an angry temperament. In modern Spanish, while 'cólera' can refer to the disease cholera, it's also commonly used to mean 'anger' or 'rage', showing how the medical and emotional meanings have remained connected.

English speakers might recognize 'cólera' through the related English word 'cholera', which comes from the same Greek root. The English words 'choler' (an archaic term for anger) and 'choleric' (meaning quick to anger) are also related, again reflecting the ancient belief in the connection between bile and both disease and temperament. The medical term 'cholesterol' also shares the Greek root 'χολή' (khole), as it was first discovered in bile.