The Spanish word 'cerdo' (meaning 'pig') has an interesting etymology that traces back to the Latin word 'cirrus', meaning 'curl' or 'tuft of hair'. This evolved into the Vulgar Latin 'cirra' meaning 'tuft', which then developed into the Spanish word 'cerda', meaning 'coarse hair'. Finally, 'cerdo' emerged as a term for 'pig', likely due to the association with the coarse, bristly hair characteristic of pigs.

A closely related Spanish word is 'cerda', which means 'bristle' or 'coarse hair'. This connection makes intuitive sense since pigs are known for their coarse, bristly hair. When learning 'cerdo', you can remember its connection to 'cerda' - the pig (cerdo) is the animal with the distinctive coarse hair (cerda)!

The English word 'cirrus' (as in cirrus clouds) comes from the same Latin root 'cirrus'. While the Spanish word developed to describe coarse hair and eventually pigs, the English borrowing retained its connection to the original meaning of curls or tufts, specifically referring to the wispy, curl-like clouds high in the atmosphere.