The Spanish word 'dedito' meaning 'little finger' is formed from two parts: the Spanish word 'dedo' (meaning 'finger') and the diminutive suffix '-ito'. The base word 'dedo' comes from Latin 'digitus', which also meant 'finger'. The diminutive suffix '-ito' is added to make the meaning 'little finger'.

This is a straightforward example of Spanish word formation where a diminutive suffix is added to create a more specific meaning. The change from Latin 'digitus' to Spanish 'dedo' shows typical sound changes that occurred as Latin evolved into Spanish, with the medial 'g' being lost and the final '-us' ending dropping off.

The simpler and more common Spanish word 'dedo' (finger) is directly related to 'dedito', as it is the base word from which 'dedito' is formed. Spanish speakers frequently use '-ito' and other diminutive suffixes to create more specific or affectionate versions of base words.

The English word 'digit' is related to 'dedito', as both come from Latin 'digitus'. While 'digit' originally meant 'finger' in English (and still can in certain contexts), it has expanded to mean any numeral from 0-9 (because people counted on their fingers), and in modern usage can also refer to any numerical symbol or a finger-like anatomical structure. This shows how the same Latin root evolved differently in English and Spanish.