The only free and comprehensive online etymological dictionary of the Spanish language
dedo m. (Noun) "finger"
12th cent. From Vulgar Latin dicitus. From Latin digitus 'id.' Of unknown origin.
Asturian deu, Portuguese dedo, dígito, Galician dedo, Catalan dit, French doigt, Italian dito, Aromanian dzeadzit, Romanian: deget, Sardinian didu

In the 3rd or 4th cent. text Appendix Probi we find the line: digitus non dicitus "[the word for 'finger' is] digitus, not dicitus." The author's spelling correction proves how the word was pronounced by common speakers, and offers a rare glimpse of the evolution of Latin into Romance languages such as Spanish.