The paper presents to Polish linguists of various specializations the Romance etymological dictionary Dictionnaire Étymologique Roman (DÉRom) which, despite having existed for several years, remains entirely unknown in Poland. Its goal is to reconstruct the Romance protolanguage, protoroman, on as many levels as possible. Its novelty lies in the application of the historical-comparative method to modern Romance forms, and reconstructing Proto-Romance forms based on them. Departure from the traditional Latin-leaning etymology brings qualitatively new results to the field of Romance diachronic linguistics. The paper concludes with examples of two dictionary entries.