The Spanish word 'alcanzable' meaning 'attainable' has an interesting etymology that traces back to the Latin word 'calx' meaning 'heel'. From this root, the Latin verb 'incalciare' was formed, meaning 'to follow at the heels'. This evolved into the Spanish verb 'alcanzar' meaning 'to reach or attain'. The modern adjective 'alcanzable' was then formed by adding the suffix '-able' (meaning 'able to be') to 'alcanzar', creating a word that literally means 'able to be reached' or 'attainable'.

This etymology shows a fascinating semantic development from a concrete physical concept (heel) to the more abstract notion of reaching or attaining something. The idea of following closely at someone's heels naturally evolved into the concept of catching up to or reaching something.

A simpler and more common related Spanish word is the verb 'alcanzar', which means 'to reach' or 'to attain'. This is the base verb from which 'alcanzable' is derived. Spanish learners might also encounter 'alcance' (reach, scope) in phrases like 'al alcance de' (within reach of).

While there aren't any common English words directly related to 'alcanzable' through the 'calx' (heel) root, English speakers might find it helpful to remember that the '-able' suffix works the same way in both languages. Just as 'attainable' means 'able to be attained' in English, 'alcanzable' means 'able to be reached' in Spanish.