The Spanish word 'tetona' comes from combining the Spanish word 'teta' (meaning 'breast') with the augmentative suffix '-ona'. The word 'teta' itself can be traced back to Ancient Greek 'títthe' (τίτθη), also meaning 'breast'. The augmentative suffix '-ona' is added to create the meaning 'large-breasted'.

This is a clear example of how Spanish uses suffixes to modify the meaning of base words. The augmentative suffix '-ona' (feminine form of '-ón') is commonly used in Spanish to indicate large size or exaggerated qualities.

The simpler and more common Spanish word 'teta' (breast) is directly related to 'tetona'. Other related Spanish words include 'tetilla' (small breast, using the diminutive suffix '-illa' instead of the augmentative '-ona') and 'tetero' (baby bottle).

While there aren't many common English words directly related to this Greek root, the medical term 'teat' (referring to a mammary gland) shares the same ancient origin. The word 'tit' in English is also believed to be related, though it developed through a different Germanic route.