The Spanish word 'cabelludo' (meaning 'hairy') has an interesting development from Latin roots. It starts with the Latin word 'caput' meaning 'head', which gave rise to 'capillus' meaning specifically 'hair of the head' in Latin. This evolved into the Spanish word 'cabello' (meaning 'hair'). The final form 'cabelludo' was created by adding the Spanish suffix '-udo', which means 'having much of' - thus creating a word that literally means 'having much hair' or simply 'hairy'.

The transformation from Latin 'capillus' to Spanish 'cabello' shows typical sound changes from Latin to Spanish, where the 'p' softened to 'b' and the '-us' ending was modified to '-o', following regular patterns of Spanish word evolution.

A simpler and more common Spanish word that's related to 'cabelludo' is 'cabello', meaning 'hair'. This is a fundamental word that Spanish learners typically learn early on. You might also encounter related words like 'cabellera' (head of hair) in Spanish. Understanding that 'cabelludo' essentially means 'full of cabello' can help remember its meaning.

While not immediately obvious, English words like 'capital' and 'captain' are distant relatives of 'cabelludo', as they all trace back to the Latin 'caput' meaning 'head'. The English word 'capillary' is even more closely related, coming from the same Latin word 'capillus' (hair of the head) - it was named this way because these tiny blood vessels are as thin as a hair!